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A process for recovering carbon monoxide and hydrogen from the dehydrogenation tail gas of methanol dehydrogenation synthesis methyl formate unit

A technology of methyl formate and carbon monoxide, which is applied in the chemical industry, can solve the problems of increased production cost of methyl formate and waste of hydrogen, and achieve the effects of reducing purification load, improving recovery efficiency, and improving flexibility

Active Publication Date: 2016-06-01
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methanol dehydrogenation tail gas is a relatively clean gas containing hydrogen and carbon monoxide, but direct combustion or discharge results in waste of hydrogen and an increase in the production cost of methyl formate

Method used

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  • A process for recovering carbon monoxide and hydrogen from the dehydrogenation tail gas of methanol dehydrogenation synthesis methyl formate unit

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Embodiment 1

[0023] A process for recovering carbon monoxide and hydrogen from the dehydrogenation tail gas of the methanol dehydrogenation synthesis methyl formate unit. In this process, the recovery of the dehydrogenation tail gas from methanol dehydrogenation to methyl formate adopts steam reforming to produce hydrogen-membrane separation decarburization- The process method of hydrogen extraction by pressure swing adsorption.

[0024] The composition of the dehydrogenation tail gas from methanol dehydrogenation to methyl formate after gas-liquid separation is (v / v%): CO7.20%; CO 2 2.30%; CH 3 OCH 3 0.80%; CH 4 1.00%; H 2 88.70%. Gas volume is 2000Nm 3 / h, the gas pressure is 0.1MPa. Using Cu:Zn:Al (molar ratio) = 8:1:0.8:0.2 carbon monoxide steam reforming catalyst, the reaction temperature is 230°C, the pressure is 1.5MPa, and the reaction space velocity is 3000h -1 , add water vapor 8.0kmol / h, the molar ratio of carbon monoxide and water in the dehydrogenation tail gas is 1:1.2...

Embodiment 2

[0027] A process for recovering carbon monoxide and hydrogen from the dehydrogenation tail gas of a methanol dehydrogenation synthesis methyl formate unit. In this process, the recovery of the dehydrogenation tail gas from methanol dehydrogenation to methyl formate adopts steam reforming hydrogen production-pressure swing adsorption decarburization -The technological method of hydrogen extraction by pressure swing adsorption.

[0028] After gas-liquid separation, the composition of methanol dehydrogenation to methyl formate dehydrogenation tail gas is (v / v%): CO8.50%; CO 2 2.05%; CH 3 OCH 3 0.680%; CH 4 1.12%; H 2 87.65%. Gas volume is 3500Nm 3 / h, the gas pressure is 0.1MPa. Using Cu: Zn: Al (molar ratio) = 7:1.2:0.78:0.25 carbon monoxide steam reforming catalyst, the reaction temperature is 250°C, the pressure is 2.0MPa, and the reaction space velocity is 1200h -1 , adding 26.56kmol / h of water vapor, the molar ratio of carbon monoxide and water in the dehydrogenation ...

Embodiment 3

[0030] A process for recovering carbon monoxide and hydrogen from the dehydrogenation tail gas of a methanol dehydrogenation synthesis methyl formate unit. In this process, the recovery of the dehydrogenation tail gas from methanol dehydrogenation to methyl formate adopts steam reforming hydrogen production-pressure swing adsorption hydrogen extraction way of workmanship.

[0031] The composition of the dehydrogenation tail gas from methanol dehydrogenation to methyl formate after gas-liquid separation is (v / v%): CO6.20%; CO 2 2.00%; CH 3 OCH 3 0.65%; CH 4 0.80%;H 2 90.35%. Gas volume is 2000Nm 3 / h, the gas pressure is 0.1MPa. Using Cu:Zn:Al (molar ratio) = 8:1.5:0.75:0.25 carbon monoxide steam reforming catalyst, the reaction temperature is 245°C, the pressure is 1.8MPa, and the reaction space velocity is 2000h -1 , adding 20.76kmol / h of water vapor, the molar ratio of carbon monoxide and water in the dehydrogenation tail gas is 1:3.0, and the reformed gas volume afte...

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Abstract

The invention relates to the field of chemical industry, in particular to a process for recovering carbon monoxide and hydrogen from the dehydrogenation tail gas of a methanol dehydrogenation synthesis methyl formate unit. The process includes steps 1) separating the dehydrogenation tail gas containing carbon monoxide and hydrogen discharged from the methanol dehydrogenation synthesis methyl formate unit; 2) returning the liquid phase containing methanol and methyl formate to the methyl formate unit, The dehydrogenation tail gas enters the compressor to boost the pressure; 3) The boosted dehydrogenation tail gas enters the vaporization tower together with the desalinated water after heat exchange for vaporization, and then enters the conversion hydrogen production reactor for water after being overheated by the heater to the reaction temperature. Steam reforming reaction; 4) The reformed gas after purification enters the hydrogen recovery unit for hydrogen purification. The process fully recycles carbon monoxide and hydrogen in methanol dehydrogenation tail gas, eliminates the direct discharge of hydrocarbon-containing hydrogen, improves the utilization efficiency of dehydrogenation tail gas, reduces its impact on the environment, and further reduces the operation of the device cost.

Description

technical field [0001] The invention relates to a hydrogen recovery and production process in the hydrogen-containing industrial tail gas in the chemical industry, in particular to a process for recovering carbon monoxide and hydrogen in the dehydrogenation tail gas of a methanol dehydrogenation synthesis methyl formate unit. Background technique [0002] A large amount of industrial exhaust gas is produced in the process of modern industrial production. Under the background of global warming and the depletion of non-renewable resources, the comprehensive utilization of valuable components in industrial waste gas has very important strategic significance and energy-saving and emission-reduction effects. . The recycling technology of industrial waste gas containing hydrogen, carbon monoxide or carbon dioxide has been vigorously developed in the field of coal chemical industry. Compared with the industrial production process of hydrogen and carbon monoxide, the investment and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/18C01B3/34C01B3/50C01B32/40
Inventor 胡志彪徐晓峰李倩黄宏程金燮
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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