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A process for producing low-carbon mixed alcohols from syngas and co-producing urea and natural gas

A low-carbon mixed alcohol and synthesis gas technology, which is applied in the preparation of hydroxyl compounds, the preparation of organic compounds, and gas fuels, etc., can solve the problems of unsuitable industrialization, complex operation and management, and difficulty in real implementation. Single process and the effect of saving investment

Active Publication Date: 2017-09-19
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is difficult to truly realize in industrial production. Obviously, these two processes have cumbersome processes and complicated operation and management, which are not suitable for industrial promotion.

Method used

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  • A process for producing low-carbon mixed alcohols from syngas and co-producing urea and natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Preparation and purification of pure syngas

[0055] Using lignite with a water content of 26% as raw material, oxygen and water vapor are introduced to produce crude gas through pressure gasification of crushed coal (gasification pressure 4.0 MPa, gasification temperature 1150°C). The composition of the crude gas by volume percentage is: CO: 46.35, H 2 : 26.73, CO 2 : 16.77, CH 4 : 9.94, H 2 S: 0.21;

[0056] The crude gas is subjected to sulfur-resistant transformation under the catalyst of Qingdao Lianxin QDB-04 at 260°C, 3.5MPa, and the volumetric space velocity calculated by dry gas is 4000h -1 , the converted water / gas molar ratio is 0.32;

[0057] The converted raw gas and low-carbon alcohol purge gas are separated by PSA for H 2 After the gas enters the low-temperature methanol washing together, the H 2 S down to 0.1ppm, CO 2 2 S concentrated gas sent to sulfur recovery, CO 2 sent to the synthetic urea unit;

[0058] The crude gas washed with low-t...

Embodiment 2

[0069] (1) Preparation and purification of pure syngas

[0070] Using bituminous coal as raw material, feed oxygen and water vapor through a crushed coal slag gasifier (gasification pressure 4.5MPa, gasification temperature 1200°C) to produce crude gas. The composition of crude gas by volume percentage is: CO: 47.14, h 2 : 26.49, CO 2 : 15.55, CH 4 : 10.69, H 2 S: 0.13;

[0071] The crude gas is subjected to sulfur-tolerant conversion at 280°C, 4.0MPa, Qilu Petrochemical QCS-04 catalyst, and the volumetric space velocity calculated by dry gas is 4500h -1 , the converted water / gas molar ratio is 0.35;

[0072] The converted raw gas and low-carbon alcohol purge gas are separated by PSA for H 2 After the gas enters the low-temperature methanol washing together, the H 2 S down to 0.1ppm, CO 2 2 S concentrated gas sent to sulfur recovery, CO 2 sent to the synthetic urea unit;

[0073] The crude gas washed by low-temperature methanol enters the methane cryogenic separation...

Embodiment 3

[0084] (1) Preparation and purification of pure syngas

[0085] Using lignite with a water content of 28% as raw material, oxygen and water vapor are introduced to produce crude gas through pressure gasification of crushed coal (gasification pressure 5.5 MPa, gasification temperature 1350°C). The composition of the crude gas by volume percentage is: CO: 46.41,H 2 : 25.38, CO 2 : 17.17, CH 4 : 10.89, H 2 S: 0.15;

[0086] The crude gas is subjected to sulfur-resistant transformation under the EB catalyst of Hubei Institute of Chemistry at 340°C, 4.0MPa, and the volumetric space velocity calculated by dry gas is 4800h -1 , the converted water / gas molar ratio is 0.38;

[0087] The converted raw gas and low-carbon alcohol purge gas are separated by PSA for H 2 After the gas enters the low-temperature methanol washing together, the H 2 S down to 0.1ppm, CO 2 2 S concentrated gas sent to sulfur recovery, CO 2 sent to the synthetic urea unit;

[0088] The crude gas washed b...

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Abstract

A process for producing low-carbon mixed alcohol from syngas and co-producing urea and natural gas includes a coal-to-gas unit, a syngas preparation and purification unit, a low-carbon alcohol synthesis and separation unit, a gas-water separation and crude phenol refining unit, and a urea synthesis unit. The invention has the advantages of simple process, low cost and large scale.

Description

technical field [0001] The invention relates to a process for preparing low-carbon mixed alcohol from synthesis gas and co-producing urea and natural gas (LNG). Background technique [0002] Low carbon alcohol usually refers to the mixture of C1~C5 alcohols. The application prospect is very wide: 1. It is used as an alternative fuel. Although its calorific value is low, it is fully combusted and emits less CO, NOx, hydrocarbons, etc. during combustion. It is an environmentally friendly fuel; 2. Used as a fuel additive . The currently used gasoline additive methyl tert-butyl ether will eventually be banned with the advancement of technology due to problems such as storage and transportation, which provides an opportunity for the development of low-carbon alcohols. Moreover, the low-carbon alcohol has a high octane number, and has good explosion-proof and shock-resistant performance. At the same time, low-carbon alcohols have great value as chemical products and raw materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/151C07C31/04C07C31/08C07C31/10C07C31/12C07C37/68C07C37/70C07C39/04C07C39/07C07C273/04C10L3/08
CPCY02P20/52
Inventor 马英民王贵曹会博王军亭张永红赵焰飞时建敏
Owner SEDIN ENG
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