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Methanol washing technology

A methanol and process technology, applied in the field of methanol washing process, can solve the problems of high energy consumption, large circulation volume, large volume of absorption tower, etc.

Inactive Publication Date: 2010-03-24
于网林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low absorption temperature of methanol solution, its circulation volume is relatively large. Compared with the Linde process, the energy consumption is slightly higher, and the volume of the absorption tower is also larger.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0005] Embodiment 1: adopt pressurized water washing, DETA hot potassium alkali and cupric acetate ammonia liquid to jointly purify crude gas containing H 2 S, CO 2 Not only is the process complicated and the purification efficiency is low, but also the sulfur-containing waste gas is difficult to recycle during the washing and purification process, causing environmental pollution. In the transformation of the process flow of ammonia production by pressurized gasification, the purification process of crude gas was also transformed, and the low-temperature methanol washing process technology of German Lurgi Company was introduced, and the factors of reducing investment costs were taken into account. - The 70°C level process was raised to -40°C process operation. In the actual production operation, the company aimed at the problem that the high operating temperature resulted in insufficient cooling capacity of the system and excessively high crude gas temperature, which affected ...

Embodiment 2

[0006] Example 2: 200,000 tons of synthetic ammonia was produced by partial oxidation of heavy oil. Due to the impact of rising raw material prices, it was decided to use Shell pulverized coal gasification technology to replace oil gasification to produce synthetic ammonia and realize the "oil-to-coal" raw material for synthetic ammonia. In the desulfurization and decarbonization process of Shell coal gasification shift gas, for CO 2 If the acid gas is removed by the ADA method or the tannin extract chemical absorption method, it is difficult to ensure that the desulfurization index is achieved. Even if the purified outlet gas can meet the standard, the power consumption will be very high, so it is decided to use Physical absorption method for desulfurization and decarbonization. Through the analysis and comparison of factors such as investment, operating costs, production scale, process conditions, and the requirements of purified gas indicators, as well as the discharge and ...

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PUM

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Abstract

The invention discloses a methanol washing technology. The solubility of methanol in CO2, H2S, S is larger at low temperature and the methanol can absorb CO2 160-180m[3] at pressure of 3.1MPa but 1m[3] NHD only absorbs CO2 40-55m[3], thus the absorption capacity of methanol to the CO2 is about 4 times of the absorption capacity of D solution to the CO2. After desulfurization and decarburization using methanol at low temperature, the H2S content of the purification gas is < 0.1*10-6 and the CO2 content is < 20*10-6, and the CO2 product purity is above 99% and the recovery rate is >=63%. The purification technology has features of large absorption capacity, good selectivity, high purification and low cost and is especially suitable for large industrialization device such as ammonia synthesis, methanol synthesis, hydroxyl synthesis, industry hydrogen production, city gas and natural gas purification.

Description

technical field [0001] The invention relates to a methanol washing process. technical background [0002] The low-temperature methanol washing process is an acid gas purification process jointly developed by Linde and Lurgi in Germany. This process uses cold methanol as the acid gas absorption liquid, and utilizes the low temperature of methanol at about -60°C for acid gas purification. The physical characteristics of the gas solubility are extremely large, and at the same time, it selectively absorbs H in the raw gas in stages 2 S, CO 2 And various organic sulfur and other impurities. Most of the large-scale synthetic ammonia units that use residual oil and coal as raw materials use this kind of purification process. In addition, this process is also widely used in the purification process of production equipment such as methanol synthesis, base synthesis, industrial hydrogen production, city gas and natural gas desulfurization. At present, more than 100 sets of large a...

Claims

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Application Information

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IPC IPC(8): C10K1/16C07C31/04C07C29/151
Inventor 于网林
Owner 于网林