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A process for comprehensive utilization of coal-based low-carbon alcohol and carbon dioxide

A carbon dioxide and low-carbon alcohol technology, applied in the field of co-production of urea and LNG, can solve the problems of unsuitable for industrialization, difficult to realize, complicated operation and management, etc., to avoid greenhouse gas emissions, easy to operate and manage, and single process Effect

Active Publication Date: 2017-11-28
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 comprehensive utilization of coal-based low-carbon alcohol and carbon dioxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Preparation and purification of pure synthesis gas

[0052] Using bituminous coal as the raw material, oxygen and steam are injected into the crushed coal to pressurized gasification (gasification pressure 4.5MPa, gasification temperature 1200℃) to produce crude gas. The composition of crude gas by volume percentage is: CO: 48.29, H 2 : 24.31, CO 2 : 14.26, CH 4 : 12.96, H 2 S: 0.18;

[0053] Crude gas is subjected to sulfur-tolerant shift at 250°C, 3.5MPa, and Qingdao Lianxin QDB-04 catalyst, and the volumetric space velocity is 4000h based on dry gas. -1 , The water / gas molar ratio after transformation is 0.35;

[0054] The converted crude coal gas and low-carbon alcohol purge gas are separated by PSA H 2 The latter gas enters the low-temperature methanol wash together, and passes through the low-temperature methanol wash at a temperature of -40°C and a pressure of 3.5MPa to make H 2 S drops to 0.1ppm, CO 2 2 S concentrated gas is sent to sulfur recovery;

[0055] The crud...

Embodiment 2

[0064] (1) Preparation and purification of pure synthesis gas

[0065] Lignite with a water content of 22% is used as raw material, oxygen and steam are fed into the crushed coal and pressurized gasification (gasification pressure 4.0MPa, gasification temperature 1240℃) to produce crude gas. The composition of crude gas in volume percentage is: CO: 49.73, H 2 : 25.46, CO 2 : 10.09, CH 4 : 14.56, H 2 S: 0.16;

[0066] Crude gas is subjected to sulfur tolerant shift at 280℃, 3.8MPa, QCS-04 series sulfur tolerant shift catalyst produced by Qilu Petrochemical Research Institute, and the volumetric space velocity calculated as dry gas is 3500h -1 , The water / gas molar ratio after transformation is 0.28;

[0067] The converted crude coal gas and low-carbon alcohol purge gas are separated by PSA H 2 The latter gas enters the low-temperature methanol wash together, and passes through the low-temperature methanol wash at a temperature of -45°C and a pressure of 4.0MPa to make H 2 S drops to 0...

Embodiment 3

[0077] (1) Preparation and purification of pure synthesis gas

[0078] Lignite with a water content of 25% is used as raw material, oxygen and water vapor are fed into the crushed coal and pressurized gasification (gasification pressure 5.0MPa, gasification temperature 1350°C) to produce crude gas. The composition of crude gas by volume percentage is: CO: 44.29, H 2 : 23.96, CO 2 : 18.24, CH 4 : 13.27, H 2 S: 0.24;

[0079] Crude gas is subjected to sulfur-tolerant shift at 350℃, 3.8MPa, under the EB series sulfur-tolerant shift catalyst developed by Hubei Institute of Chemistry, and the volumetric space velocity calculated as dry gas is 4500h -1 , The water / gas molar ratio after transformation is 0.33;

[0080] The converted crude coal gas and low-carbon alcohol purge gas are separated by PSA H 2 The latter gas enters the low-temperature methanol wash together, and is washed with low-temperature methanol at a temperature of -45°C and a pressure of 4.3MPa to make H 2 S drops to 0.1pp...

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Abstract

The invention relates to a process for preparing lower alcohols from coal and comprehensively utilizing carbon dioxide. The process comprises a coal-to-gas unit, a synthesis gas preparation and purification unit, a lower alcohol synthesis and separation unit, an ammonia synthesis unit and a main urea synthesis unit. The process provided by the invention has the advantages of being simple in process, low in cost and massive in production.

Description

Technical field [0001] The invention relates to a process for preparing low-carbon alcohol from coal, in particular to a process for preparing low-carbon alcohol from coal through synthesis gas and comprehensively utilizing carbon dioxide to produce urea and LNG. Background technique [0002] Lower alcohol usually refers to a 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, but it is fully burned, and emits less CO, NOx, hydrocarbons, etc. during combustion, which is an environmentally friendly fuel; 2. Used as a fuel additive . The current gasoline additive methyl tert-butyl ether will eventually be banned due to storage and transportation problems, as technology advances, which provides an opportunity for the development of low-carbon alcohols. In addition, the low-carbon alcohol has a high octane number, and has good explosion-proof and seismic performance. At the same time, low-carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C273/04C07C31/04C07C31/08C07C31/10C07C31/12C07C29/151C10L3/08C10L3/10
CPCY02P20/141
Inventor 马英民曹会博王贵赵焰飞王军亭时建敏张永红
Owner SEDIN ENG
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