Method for producing liquefied natural gas and carbinol simultaneously

A technology for liquefied natural gas and methanol, applied in chemical instruments and methods, production of bulk chemicals, preparation of organic compounds, etc., can solve problems such as the risk of not being able to respond to market changes, and achieve the effect of reducing energy consumption and creating benefits

Active Publication Date: 2009-11-11
BEIJING ZHONGKE RUIAO ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a single methanol production process plan obviously cannot cope with the risk of market changes

Method used

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  • Method for producing liquefied natural gas and carbinol simultaneously

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Coke oven gas at 20000Nm 3 The flow rate per hour is pressurized to 0.4MPa by the screw compressor and then enters the pretreatment process. The pretreatment adopts the temperature-swing-pressure-swing adsorption method. The adsorbent is coke plus activated carbon, and the benzene in the coke oven gas is removed at 35°C. , naphthalene, tar and HCN, using the tail gas from the hydrogen purification process as the regeneration medium; then the coke oven gas pressure is increased to 1.0MPa, and the temperature is controlled at 40°C before entering the pressure swing adsorption process (methane concentration). Here, 97% of H in the coke oven gas 2 through the adsorbent, while CH 4 , CO, CO 2 and N 2 is adsorbed. unadsorbed H 2 The flow rate is 13150Nm 3 / h, the concentration is 88.7%, the methane content is 1.03%, and then enters the pressure swing adsorption (hydrogen purification) process, at 0.9MPa, 40 ℃ its concentration is increased to 99.8%, sent out as the raw ma...

Embodiment 2

[0040] Coke oven gas at 18000Nm 3 The flow rate of / h is boosted to 0.08MPa by the Roots blower and then enters the pretreatment process. The temperature-swing-pressure-swing adsorption method is used for pretreatment. The adsorbent is coke plus molecular sieves. The benzene, naphthalene, tar and HCN in the coke oven gas are removed at 40°C, and steam is used as the regeneration medium; then the pressure of the coke oven gas is increased. After reaching 1.2MPa and cooling to 40°C, it enters the pressure swing adsorption process (methane concentration). 98% H in coke oven gas 2 through the adsorbent, while CH 4 , CO, CO 2 and N 2 is adsorbed. unadsorbed H 2 The flow rate is 11890Nm 3 / h, the concentration is 89%, the methane content is 1.05%, and then enters the pressure swing adsorption (hydrogen purification) process, at 1.1MPa, 40 ℃, the purity is increased to 99.9%, and sent to the methanol synthesis process as raw material gas. The adsorbed methane-rich gas (60.02%...

Embodiment 3

[0044] The flow rate is 25000Nm 3 / h of coke oven gas is pressurized to 0.05MPa by a centrifugal blower and then enters the pretreatment process. The pretreatment adopts the temperature-swing-pressure-swing adsorption method. Benzene, naphthalene, tar and HCN, using the tail gas from the hydrogen purification process as the regeneration medium; then the pressure of the coke oven gas is increased to 2.0MPa, cooled to 40°C, and then enters the pressure swing adsorption process (methane concentration). Here, 98.5% H in the coke oven gas 2 Through the adsorbent, CH 4 , CO, CO 2 and N 2 is adsorbed. The unadsorbed H2 flow rate is 16620Nm 3 / h, the concentration is 88.9%, the methane content is 1.01%, and then enters the pressure swing adsorption (hydrogen purification) process, at 0.9MPa, 40 ℃ its concentration is increased to 99.8%, sent out as the raw material gas of synthesizing methanol. The adsorbed methane-rich gas (60.15% methane content) is desorbed with a pressure of...

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Abstract

The invention provides a method for producing liquefied natural gas and carbinol simultaneously, comprising the following steps of: preprocessing a coke oven gas, carrying out pressure swing adsorption on the preprocessed coke oven gas, thus obtaining non-adsorbed H2 and desorbed gas rich in firedamp after adsorption; carrying out pressure swing adsorption on the obtained gas rich in firedamp again, wherein CO2 and organic sulfur are adsorbed and removed and the non-adsorbed gas is the gas rich in firedamp; depickling the re-obtained gas rich in firedamp; separating a mixed gas of CO2 and H2Sand the gas rich in firedamp; obtaining the CO2 by carrying out fine devulcanization on the mixed gas of the CO2 and the H2S; liquefying the gas rich in firedamp, thus obtaining the liquefied naturalgas and the gas rich in CO; and leading the obtained non-adsorbed H2 and the finally obtained CO2 and the gas rich in CO to react after being mixed, thus generating the carbinol. The process sufficiently utilizes the effective composition of the coke oven gas, reduces the energy consumption of the purification and separation of the coke oven gas, and has the demonstration efficiency of energy saving, exhaust reducing and changing waste into treasure.

Description

technical field [0001] The invention belongs to the field of coking industry, and relates to a method for simultaneously producing liquefied natural gas and methanol, in particular to a method for simultaneously producing liquefied natural gas and methanol by using coke oven gas as a raw material. Background technique [0002] Coke oven gas is a by-product of coking, and its main component is H 2 、CH 4 , CO and CO 2 , is a good chemical raw material and high calorific value fuel. However, it contains a wide variety of impurities (such as various forms of sulfur, tar, benzene, naphthalene, ammonia and HCN, etc.) and complex components, which seriously affect its scope of use. [0003] Using coke oven gas as raw material, the products that can be produced include: liquefied natural gas, methanol, liquid ammonia, urea and hydrogen peroxide, etc. However, it is an indisputable fact that simply using coke oven gas as a raw material to produce any of the above-mentioned produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C07C31/04C07C29/151
CPCY02P20/10Y02P20/52
Inventor 史红兵任小坤孙郁张武
Owner BEIJING ZHONGKE RUIAO ENERGY TECH CO LTD
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