34 results about "Rectisol" patented technology

The present invention discloses a split-flow rectisol device, which comprises an absorption tower, a medium pressure flash tower, a reabsorber, a hot regenerating tower, a methanol water tower, a tail gas washing tower, a plurality of heat exchangers, pumps and a circulation compressor; and the upper section of the reabsorber is provided with a flash distillation section. The split-flow rectisol device is not provided with a CO2 product tower, and reduces the complexity of the flow and the investment on the premise of ensuring that CO2 product gas is qualified. The split-flow rectisol device is provided with a novel split-flow rectisol (acid gas removal) flow for absorption from a semi-lean methanol liquid feeding absorption tower on the upper section of the reabsorber, reduces the dosage of lean methanol of the absorption tower, further can reduce the energy consumption of the hot regenerating tower for hot regeneration, and saves the dosage of gas stripping nitrogen, consumption of steam, and low level cold quantity used when the lean methanol is cooled.

A process of coke oven gas and synthesis gas to produce low-carbon alcohol and by-product natural gas is to mix coke oven gas and synthesis gas to form crude raw material gas, which is compressed and washed with low-temperature methanol, and the released hydrogen sulfide is recovered by Claus sulfur removal, The removed carbon dioxide is discharged at high altitude; the raw material gas washed and purified by low-temperature methanol is subjected to cryogenic separation, and the extracted methane is produced into LNG products. , the gas is separated by PSA. After the separation, it mainly includes CO and H2 and returns to the low-temperature methanol washing cycle. The other gases after separation are sent to the flare for combustion and emission as purge gas. The separated liquid phase products enter the low-carbon alcohol separation to obtain low-carbon alcohol products. The invention has the advantages of improving the utilization rate of the raw material gas, diversifying the products and regulating the excess production capacity.

An energy-saving one-step rectisol method belongs to the technical field of gas purification. The method is characterized in that two or three desulfuration segments of an absorption tower employ a sulfur-free semi-lean solution for absorption; intersegment coolers are adopted; the desulfuration segments can remove sulfide and approximately 50-60% of CO2 from virgin gas simultaneously; only one decarbonization segment of the absorption tower is adopted; a lean solution is used at the top of the tower, and the sulfur-free semi-lean solution is added; flash steam is absorbed by a sulfur-containing semi-lean solution in the medium-pressure flash evaporation process; after most of CO2 in the flash steam is absorbed, the solution is delivered to a lower tower of an H2S concentrating tower for gas stripping; a sulfur-free methanol solution gas stripping tower is additionally adopted and divided into one or two segments; solutions at the segments are heated appropriately before entering the tower; and the sulfur-free semi-lean solution is delivered to the absorption tower after the gas stripping. The energy-saving one-step rectisol method has the effects and benefits that the number of plates of the absorption tower is reduced by about 20%, the tower diameter is shortened, the circulation volume of a methanol lean solution is reduced, the regeneration load of a rich solution is also reduced, the energy consumption of a device is saved by about 30%, and the device investment is saved.

The invention discloses a device for treating low temperature methanol washing ammonium crystallization and purifying barren solution methanol and a method for treating low temperature methanol washing ammonium crystallization and purifying barren solution methanol by virtue of the device. The device comprises a thermal regeneration tower of which the top is not provided with a low-temperature condenser, wherein a gas outlet formed in the top of the thermal regeneration tower is communicated with a gas phase separator by virtue of a water cooler, a gas phase outlet of the gas phase separator is communicated with a methanol water-washing tower; the bottom of the gas phase separator is provided with a liquid phase outlet communicated with a liquid phase delivery pipeline, the liquid phase delivery pipeline is divided into two paths, one of which returns back to the top of the thermal regeneration tower and the other is communicated with a methanol-ammonium separation tower. According to the device and the method, by adopting the normal temperature water washing manner, the problems that the condenser and the pipeline arranged on the top of the thermal regeneration tower are blocked by the crystallization of ammonium carbonate in the traditional flow process is solved and the problem of the treatment of intermittent pollution discharge methanol is further solved and thus barren solution methanol is purified and the methanol consumption is reduced.

A process for synthesizing gasoline through methanol and co-producing natural gas and hydrogen in a coke oven. The coke oven gas is eluted with low-temperature methanol to remove sulfur and carbon dioxide. After removing sulfur and carbon dioxide, the coke oven gas enters cryogenic methane for separation, and the separated liquid The phase methane product is sent to the LNG storage tank, while the remaining coke oven gas is divided into two parts. The first part is sent to the pressure swing adsorption to remove hydrogen. The second part of the coke oven gas is mixed with further desulfurization and mixed with part of the carbon dioxide gas from the low-temperature methanol wash, the cycle gas of the methanol separator and part of the cycle gas of the cycle gas compressor to synthesize methanol, and then carry out the synthetic oil reaction, and then the oil phase is processed into oil Products are separated to obtain fuel gas, liquefied petroleum gas, heavy oil and gasoline products. The invention has the advantages of simple technological process, less equipment investment and low energy consumption.

The invention relates to a method for preparing liquefied natural gas from semi-coke tail gas. The method includes: firstly, after decoking and benzene and naphthalene removal of semi-coke tail gas, and sending to a rectisol unit for purification and desulfurization; then, mixing the desulfurized semi-coke tail gas with high-methane gas, jointly sending into a methanation unit for methanation to obtain a crude methane gas product, sending into the rectisol unit for purification and decarbonization; finally, performing cryogenic separation to remove nitrogen to obtain liquefied natural gas. Compared with the prior art, the method has advantages that by semi-coke tail gas treatment through the rectisol unit and the methanation unit, circulation absorbing agent consumption is sharply reduced,and energy consumption and system CH4 loss in a decarbonization process are reduced; in addition, by adoption of recovered CH4-rich gas and injection of water and / or system self-produced water vaporinto the methanation unit, methanation reaction temperature rise can be controlled so as to guarantee a methanation process against temperature runaway; moreover, heat balance of a whole system can beeffectively realized in the whole process, and economy in preparation of LNG (liquefied natural gas) from the semi-coke tail gas is improved.

The method involves carrying out the cooling of the regenerated adsorbent (A,B) to the adsorption temperature with a partial stream of the gas mixture to be analyzed at the end of the regeneration phase. The partial flow of the main stream or the partial stream is deducted, cooled and supplied to the combined stream before or after heat exchange with a medium. The combined flow serves the cooling of the feed gas to be supplied to the Rectisol(RTM: Acid gas removal process) process.

The invention discloses a Rectisol tail gas recovery system and method and their application and solves the problem that Rectisol tail gas treatment is high in cost. The technical process is simple, the main parameter is fan outlet pressure, and process parameters to be controlled are few and easy to adjust; Rectisol vented tail gas replaces seal nitrogen in a coal mill, the waste is utilized, resources are saved, and the investment in Rectisol tail gas treatment is lowered. According to the technical scheme, the Rectisol tail gas recovery system comprises a tail gas source, a separator, a fan and a coal mill, drops are removed from the tail gas source via the separator, the tail gas source is pressurized via a fan and is delivered to a sealed air passage in the coal mill so as to arrive at sealing, and the tail gas source is a Rectisol tail gas source.

The invention discloses a low-temperature spiral wound heat exchanger for a non-converted gas cooler, and is mainly applied to the coal chemical industry fields of coal based syngas, coal-to-methanol, and the like, and the technical fields of the rectisol process comprising low-temperature gas purification and low-temperature liquefaction separation, and the like. The low-temperature spiral wound heat exchanger is tower spiral wound heat exchange equipment with the combination of single-fluid and double-fluid, achieving the purpose of precooling non-converted feed gas by process cold gas by mainly utilizing rectisol process off-gas and low-temperature syngas to precool the non-converted feed gas. According to the low-temperature spiral wound heat exchanger for the non-converted gas cooler, disclosed by the invention, the basic structure and the heat exchange process calculation method of a compound spiral wound heat exchanger combining a single-tube-bundle spiral wound heat exchanger and a double-tube-bundle spiral wound heat exchanger for the non-converted gas cooler are systematically researched, the method of introducing the moderate temperature cold source at the middle section and combining the single-fluid and double-fluid spiral wound heat exchangers up and down is adopted, and the entry points of multi-fluid heat exchange at different potential temperatures are improved, so that the heat exchange efficiency is enhanced, the heat exchange area is saved, and the size of the heat exchanger is reduced.

The invention provides a method for preparing liquefied natural gas (LNG) through sulphur-tolerant methanation of coke-oven gas. The method is characterized by subjecting the coke-oven gas to direct three-stage methanation reactions on a supported molybdenum-based sulphur-tolerant methanation catalyst after removing the impurities such as oil, naphthalene, benzene and the like from the coke-oven gas, then removing the impurities such as sulphur, CO2, C2-4 hydrocarbons and the like once through rectisol, and finally separating N2, H2 and the like through one-time subzero liquefaction, thus obtaining the LNG with methane content higher than 97%. The method has the advantages of simple process flow, small equipment investment, low comprehensive energy consumption and excellent natural gas products.

The invention provides a cleaning method for a methanol fine filter of a low-temperature methanol washing device. The cleaning method comprises the following steps of, firstly, opening the end plug of the fine filter; secondly, disassembling the filter element of the fine filter; thirdly, washing the filter element of the fine filter with water for 5-25 minutes; fourthly, cleaning the filter element through a copper brush until no impurities can be sensed from the surface; fifthly, soaking the filter element of the filter in phosphoric acid for 10-15 hours; sixthly, performing ultrasonic cleaning on the filter core for 28-36 hours; seventhly, reassembling the filter element of the fine filter; eighthly, reassembling the end plug of the filter. The cleaning method for the methanol fine filter of the low-temperature methanol washing device can effectively clean the filter element of the filter, prolong the service time of the cleaned filter, reduce the filter cleaning cost, improving the operating efficiency of the filter and save the maintenance cost in millions every year.

The invention provides a low-temperature rectisol process, comprising the following steps: a) injecting methyl alcohol solution into untreated gases; b) cooling the untreated gases in which methyl alcohol solution is injected; and c) injecting the methyl alcohol solution into the cooled untreated gases again. The invention also provides a low-temperature rectisol device, comprising a second jet bubbler, a first heat exchanger and a first jet bubbler, wherein the second jet bubbler injects the methyl alcohol solution into the untreated gases, the first heat exchanger cools the untreated gases in which the methyl alcohol solution is injected, and the first jet bubbler injects the methyl alcohol solution into the cooled untreated gases again. The low-temperature rectisol process provided by the invention injects the methyl alcohol solution into the untreated gases before cooling to ensure that methyl alcohol is atomized and blended into gaseous phase, and the freezing point of the untreated gases is lowered; when cooling, moisture in the untreated gases has small possibility of condensing, so that the phenomenon that tube bundles are blocked in the heat exchanger can not appear, and gas output does not decrease.

The invention discloses a measurement method for hydrogen sulfide content of a methanol solution and application of the measurement method. The measurement method comprises the following steps of constructing an absorbancy-hydrogen sulfide content standard curve; preparing a methanol solution to be measured into a sample to be measured; testing the sample to be measured through a spectrophotometer to obtain an absorbancy value of the sample to be measured; and obtaining a hydrogen sulfide content of the sample to be measured from the absorbancy-hydrogen sulfide content standard curve according to the measured absorbancy value. The hydrogen sulfide content of the methanol solution can be obtained by constructing the absorbancy-hydrogen sulfide content standard curve, preparing the methanol solution to be measured into the sample to be measured, measuring the absorbancy value of the sample to be measured and obtaining the result. The method is applied to liquid in actual production, so that the hydrogen sulfide content of a 'rectisol' solution can be measured accurately and conveniently, and therefore, the deficiency of the methanol solution can be determined, and the absorption capacity of the methanol solution in a purification process is guaranteed.