Sulfur-tolerant shift process for preparing methyl methanol syngas

A technology of sulfur-resistant conversion and synthesis gas, which is applied in the petroleum industry, the preparation of hydroxyl compounds, and the chemical modification of combustible gases. The effect of mild conditions and prolonging the service life

Active Publication Date: 2009-04-22
青岛联信催化材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the water/gas ratio in the CO shift process is relatively large. For the shift of high-concentration CO raw material gas, because the CO concentration and water/gas are both high, the driving force of the reaction is large, and the catalyst loading in the first stage only needs a small change. , it will significantly affect the hot spot temperature of the bed, so the amount of catalyst must be accurate, otherwise it will cause the bad result of "flying temperature" of the bed due to the increase of reaction depth
Practice has proved that in the initial stage of start-up of some factories, due to the low lo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The first stage of conversion: the crude gas with a CO dry basis content of 62% first enters the gas-liquid separator, and the crude gas coming out of the top of the separator is heated to 205°C, enters the detoxification tank to remove impurities, and then enters the first reactor Carry out shift reaction, the water / gas volume ratio of the first reactor inlet wherein is 0.21, inlet temperature is 205 ℃, the hot spot temperature of the first reactor bed layer is 378 ℃, reaction pressure 3.6MPa, the first reactor outlet crude The volume content of dry basis CO in the gas is 42%;

[0054] The second stage of transformation: the transformation gas with a dry basis content of CO of 42% exchanges heat with the inlet gas of the first reactor, then sprays water to cool down to 210°C and enters the second reactor for transformation reaction. The water / gas volume ratio is 0.30 , the inlet temperature is 210°C, the hot spot temperature of the second reactor bed is 405°C, and the ...

Embodiment 2

[0056] The first conversion stage: the crude gas with a CO dry basis content of 66% first enters the gas-liquid separator, and the crude gas coming out of the top of the separator is added with steam and heated to 200°C, enters the detoxification tank to remove impurities, and then enters the second stage A reactor is subjected to shift reaction, wherein the water / gas volume ratio at the inlet of the first reactor is 0.26, the inlet temperature is 215°C, the hot spot temperature of the first reactor bed is 400°C, and the reaction pressure is 3.6MPa. The first reaction The volume content of CO on a dry basis in the crude gas at the outlet of the device is 45%;

[0057] The second stage of transformation: the transformation gas with a dry basis content of CO of 45% exchanges heat with the gas entering the first reactor, then sprays water to cool down to 260°C, and then injects water vapor, enters the second reactor for transformation reaction, water / The gas volume ratio is 0.45...

Embodiment 3

[0059] The first conversion stage: the crude gas with a CO dry basis content of 66% first enters the gas-liquid separator, and the crude gas coming out of the top of the separator is added with steam and heated to 200°C, enters the detoxification tank to remove impurities, and then enters the second stage A reactor is subjected to a shift reaction, wherein the water / gas volume ratio at the inlet of the first reactor is 0.35, the inlet temperature is 200°C, the hot spot temperature of the first reactor bed is 428°C, and the reaction pressure is 3.6MPa. The first reaction The volume content of CO on a dry basis in the crude gas at the outlet of the device is 37%;

[0060] The second stage shift: After the gas from the first stage is mixed with 37% raw material gas, the dry basis content of CO is 45%, heat exchange is carried out, and then water is sprayed to cool down to 220°C and enters the second shift reactor, the water / gas volume ratio 0.2, the inlet temperature is 280°C, th...

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PUM

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Abstract

The invention provides a CO sulfur tolerant shift method for preparing methanol synthesis gas. The method at least comprises the following two stages of shift: crude gas is pretreated and is heated up to 180 to 260 DEG C, the gas enters a first reactor for the shift reaction when a water to gas volume ratio is 0.1 to 0.55, the bed temperature is 330 to 420 DEG C, and the CO volume content is 36 to 48 percent after the first shift reaction; and the gas from the first reactor is cooled down to 200 to 280 DEG C through heat exchange and water spray, the gas enters a second reactor for the shift reaction when a water to gas volume ratio is 0.1 to 0.75, the bed temperature is 390 to 450 DEG C, and the dry basis CO volume content in the final outputted gas is 8 to 35 percent. A CO sulfur tolerant shift catalyst is used during the two stages of shift. The outputted gas at the second stage can be directly used or for preparing the methanol synthesis gas or be used for preparing the methanol synthesis gas after a third stage of deep shift gas distribution. The method has the advantages of low water to gas ratio, energy conservation, low equipment cost, wide raw material sources, and the like.

Description

technical field [0001] The present invention relates to a sulfur-resistant conversion process for producing methanol synthesis gas from high-concentration CO raw material gas, in particular to a sulfur-resistant conversion process for producing methanol synthesis gas from high-concentration CO raw material gas in two or more stages using coal as raw material craft. Background technique [0002] Methanol is an important basic chemical raw material, which can be used to produce various organic products such as formaldehyde, acetic acid, and dimethyl terephthalate. Methanol is also an important solvent and is widely used in the production of pesticides, medicines, spices and the three major synthetic materials. Especially after the 1980s, due to the environmental protection policy of "unleaded gasoline" promoted by industrialized countries in the world, the unleaded gasoline additive MTBE using methanol as raw material has been developed and widely used, becoming the second la...

Claims

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Application Information

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IPC IPC(8): C10K3/00C07C31/04C07C29/151
Inventor 纵秋云刘捷张国杰卢正滔李兆军
Owner 青岛联信催化材料有限公司
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