41results about How to "Reduce the pressure of purification" patented technology

The invention discloses a purification process of monofluoromethane, comprising the following steps: (1) preliminary adsorption: preliminarily removing impurities from monofluoromethane to be purifiedby an adsorbent; (2), feeding and purification: introducing the monofluoromethane to be purified, subjected to preliminary adsorption, into a cooled rectification column to remove light components inthe monofluoromethane to be purified, then discharging a material in the rectification column into a storage container, and remaining heavy components in the column, wherein the material put into thecontainer is monofluoromethane, and the purity is 4N-5N. According to the monofluoromethane purification process disclosed by the invention, preliminary adsorption by the adsorbent is performed, andthen rectification by the rectification column is performed; the purification process can reduce the purification pressure of the rectification column, ensure the stability of purification, and obtaina product with stable purity; moreover, even if the adsorbent is saturated and not replaced in time, the rectification column can trap impurities, so that the quality of a purified product remains stable.

The invention relates to a low-temperature calcining process for petroleum coke, particularly a low-temperature calcining process for a pot furnace for producing anodes, cathodes and electrodes for aluminum in a carbon industry and petroleum coke in a special carbon industry. By controlling the flame path temperature and the discharge speed of the pot furnace, the calcining temperature range of petroleum coke in a material pot is ensured at 1150-1220 DEG C, the discharge speed which is 10-20% higher than a normal discharge speed reaches 110-120 kg / h, and the sulfur removal amount in the calcining process of petroleum coke is reduced, so that the true density of calcined coke is ranged from 2.05 g / cm3 to 2.07 g / cm3, and an over-calcined phenomenon that the calcined coke for producing prebaked anodes in the pot furnace is avoided. As a result of a relatively low calcining temperature and shorter standing time, the sulfur removal amount in the petroleum calcining process is reduced, and the content of sulfur dioxide in flue gas and the flue gas purifying pressure are reduced; as the furnace body temperature is reduced and the sulfur removed is reduced, corrosion of sulfur in the petroleum coke on silica bricks is alleviated, so that the service life of the furnace body is greatly prolonged under the condition that the pot furnace calcines high-sulfur coke; and acceleration of the discharge speed further improves the capacity of the pot furnace and improves the flue gas amount of a system, thereby favorably increasing the capacity of waste heat steam.

The invention discloses a recycling method for high-hardness high-salinity recycled paper paper-making wastewater. Firstly, pre-softening treatment is carried out on high-hardness wastewater by usinglime powder, and efficient interception is carried out on divalent ions and multivalent ions in the wastewater by using a membrane separation method to remove calcium, magnesium, silicon, sulfate radical and other ions. In the process of using the membrane separation method, the characteristics of the ions in the wastewater are changed by using an electromagnetic method, thereby changing deposition speed of calcium carbonate and physical characteristics of deposition to prevent the formation of hard scale so as to greatly reduce the possibility of the scale formation, the separation effect isgood, the inner treated sewage is recycled, the purification treatment pressure of the sewage is reduced, the out-emission of the sewage is reduced, and the production process is cleaner and more environmentally-friendly.

The invention discloses a deep purification method for organically discharged tail gas in an aluminum electrolysis production process. The deep purification method comprises the following steps: (1) feeding the organically discharged tail gas into a moving bed with gamma-aluminum oxide, and carrying out deep defluorination through the gamma-aluminum oxide; (2) simultaneously blowing defluorinationtail gas and ozone into a desulphurization reactor with zinc oxide slurry, wherein under the action of the ozone and a stirring condition, SO2 in the defluorination tail gas and zinc oxide react witheach other to generate zinc sulfate for desulphurization reaction, and the zinc sulfate forms a zinc sulfate solution in water; (3) heating the discharged zinc sulfate solution for evaporative concentration, and carrying out filtering and drying, thus obtaining a heptahydrate product; (4) feeding a calcium ion-containing solution into a water inlet of a Venturi jet reactor, then feeding desulphurization tail gas at the same time for mineralization reaction, and discharging decarbonization tail gas from a gas outlet. According to the method disclosed by the invention, heptahydrate and calciumcarbonate products are prepared, and SO2 and CO2 resources in aluminum electrolysis tail gas are recycled; meanwhile, the problem on pollution caused by waste calcium carbide slurry is solved, and theflue gas treatment cost is greatly reduced.

The invention relates to the technical field of waste gas treatment, in particular to emission-reduction combination equipment for microwave catalysis and biochemical treatment of VOCs (volatile organic chemicals). The emission-reduction combination equipment comprises a microwave catalytic reaction device and a biochemical reactor which are sequentially arranged, wherein the microwave catalytic reaction device comprises a catalyst layer which is arranged inside and allows waste gas to pass, a microwave emitter used for heating the catalyst layer, a catalysis gas inlet allowing waste gas to enter the microwave catalytic reaction device and a catalysis gas exhaust port allowing the waste gas to flow out; a biological purification mechanism is arranged in the biochemical reactor, and a biochemical gas inlet connected with the catalysis gas exhaust port and a biochemical gas exhaust port allowing gas to flow out are formed in the biochemical reactor. VOCs are primarily purified and treated and degraded through the microwave catalytic reaction device, harmful intermediate products generated during primary purification and treatment are purified and treated through the biochemical reactor, the purification effect is good, thorough purification and treatment are realized, and no secondary pollution is caused.

The invention discloses a method for purifying benzene pollutants in wastewater. The method comprises the steps as follows: adding low carbon alkane to the wastewater containing benzene by the volume proportion between the low carbon alkane and the wastewater containing benzene of 0.2 to 2 or 0.05 to 1; intensely churning and mixing for 5 to 180 minutes; standing for stratification; and taking the lower water layer. The purifying method can be applied in the industry to purify the wastewater containing benzene, and has low requirements for environmental conditions. The purification can be completed at the room temperature with simple tools; the operation is simple and safe; the purifying effect is prominent. The method is suitable for high-purity purification of the wastewater containing benzene; the wastewater purified by the method can meet the national standard for industrial water; the recycling rate for the wastewater is increased, so that the energy-saving and environmental-protection functions are effectively served. The method can also reduce the pressure on microbe treating ponds for purifying the wastewater containing benzene, minimize the treatment cost for environmental protection and enhance the economic benefits of the equipment.

The invention discloses a sludge deep drying method and system based on air medium circulation. The system comprises a sludge conditioning and dewatering device, a sludge pulverization and drying device, and a dryer. The method comprises the following steps: 1) adding a proper amount of an alkali-skeleton structure composite conditioner into the excess sludge with the water content of 90-95%, andstirring the excess sludge for 5-15 minutes to condition the excess sludge; dewatering the conditioned excess sludge to form a semi-dry mud cake with the water content of 45-60%; pulverizing and crushing the semi-dry mud cake into sludge powder particles with the particle size of 10-200 [mu]m, feeding dry air to dry the sludge powder particles to obtain dry sludge powder and generate moist air atthe same time; and then drying the moist air, recycling the moist air, and recycling the ineffective drying agent as the alkali-skeleton structure composite conditioner again. The method has the advantages of deep drying of sludge, low waste gas generation amount, high utilization rate of a drying agent and the like.