Method of recovering methanol from acidic gas in Rectisol unit

A low-temperature methanol washing and recovery device technology, applied in separation methods, chemical instruments and methods, separation/purification of hydroxyl compounds, etc., can solve problems such as increased energy consumption of methanol washing devices, failure to reach purification indicators, and affecting absorption effects, etc. Achieve the effect of reducing cooling energy consumption, ensuring regeneration effect, and reducing cooling energy consumption

Inactive Publication Date: 2019-05-03
DALIAN JIACHUN GAS PURIFICATION TECH DEV
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, such a process has the problem of high energy consumption, mainly due to the high cooling capacity required for acid gas cooling, accounting for about 5% of the system cooling capacity, and in processes with high sulfur content in raw gas, this proportion Can reach more than 10%
In addition, this process can meet high-temperature gasification processes such as coal-water slurry gasification and pulverized coal gasification, but when supporting low-temperature gasification processes such as crushed coal gasification and catalytic gasification, due to the complicated side reactions in low-temperature gasification processes, It will produce more impurities such as light hydrocarbons and organic sulfur. Although these impurities can be removed in the low-temperature methanol washing device, when the methanol rich liquid that absorbs these impurities is regenerated, part of the methanol in the acid gas is also recovered. Hydrocarbons or organic sulfur impurities similar to the boiling point of methanol are also brought into the system with the condensation of methanol, which not only increases the energy consumption of the entire low-temperature methanol washing device, but also makes the quality of methanol worse due to the accumulation of impurities, thus affecting the absorption effect. Resulting in failure to meet purification targets

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of recovering methanol from acidic gas in Rectisol unit
  • Method of recovering methanol from acidic gas in Rectisol unit
  • Method of recovering methanol from acidic gas in Rectisol unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The sulfur-rich methanol produced in the low-temperature methanol washing device is flashed under reduced pressure and stripped, and then enters the thermal regeneration tower C04 for regeneration to obtain methanol lean liquid and acid gas;

[0087] The methanol barren solution is recycled;

[0088] The acid gas enters the heat regeneration tower reflux tank V06 through the water cooler E12 at the top of the heat regeneration tower, and then enters the lower part of the acid gas scrubber C08. The upper part of the gas scrubber C08 is washed to absorb methanol to obtain washed acid gas and washed waste water;

[0089] The acid gas after the washing is sent to the recovery device;

[0090] The washed waste water is boosted by the acid gas scrubber bottom pump P11 at the bottom of the acid gas scrubber C08, and then passes through the waste water heat exchanger E20 to exchange heat with the high-temperature wastewater at the bottom C05 of the methanol-water separation to...

Embodiment 2

[0095] The sulfur-rich methanol produced in the low-temperature methanol washing device is flashed under reduced pressure and stripped, and then enters the thermal regeneration tower C04 for regeneration to obtain methanol lean liquid and acid gas;

[0096] The methanol barren solution is recycled;

[0097] The acid gas enters the reflux tank V06 of the thermal regeneration tower through the top water cooler E12 of the thermal regeneration tower, and then enters the lower part of the acid gas scrubber C08. The upper part of the gas scrubber C08 is washed to absorb methanol to obtain washed acid gas and washed waste water;

[0098] The acid gas after the washing is sent to the recovery device;

[0099] The washed waste water is boosted by the acid gas scrubber bottom pump P11 at the bottom of the acid gas scrubber C08, and then passes through the waste water heat exchanger E20 to exchange heat with the high-temperature wastewater at the bottom C05 of the methanol-water separat...

Embodiment 3

[0109] The sulfur-rich methanol produced in the low-temperature methanol washing device is flashed under reduced pressure and stripped, and then enters the thermal regeneration tower C04 for regeneration to obtain methanol lean liquid and acid gas;

[0110] The methanol barren solution is recycled;

[0111] The acid gas enters the heat regeneration tower reflux tank V06 through the water cooler E12 at the top of the heat regeneration tower, then passes through the acid gas heat exchanger E14 and the low-temperature acid gas at the outlet of the separation tank V05 for heat exchange and cooling, and then is further cooled by the deep cooler E13 After entering the separation tank V05, the methanol content of the separated low-temperature acid gas is 0.1% mol.

[0112] Using the above device, the cooling capacity consumed in the process of separating methanol from acidic gas is 500KW, which is 500KW higher than that in Example 1, which increases energy consumption by 10%, and red...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The application discloses a method of recovering methanol from acidic gas in a Rectisol unit. The recovery process aims to the methanol in the acidic gas in the Rectisol unit, wherein wastewater fromthe bottom of a tail gas washing column is employed to wash the acidic gas, thus selectively absorbing methanol under low pressure at normal temperature to recover the methanol. The method not only increases recovery rate of methanol and reduces cost, but also reduces consumption of cooling capacity of the unit and avoids accumulation of impurities, such as hydrocarbons, organo-sulfur and the like.

Description

technical field [0001] The application relates to a method for recovering methanol in the acid gas of a low-temperature methanol washing device, which belongs to the technical field of gas purification. Background technique [0002] The low-temperature methanol washing process is a physical absorption gas purification process, which uses low-temperature methanol as a solvent to remove acid gases in the raw gas. Low-temperature methanol washing purification process can remove H in raw gas 2 S, COS, RSH, CO 2 , HCN, NH 3 , NO, paraffin, aromatic hydrocarbon, crude gas oil and other components, and can be dehydrated to make the gas completely dry, and the absorbed useful components can be recovered in the process of methanol regeneration; at the same time, this process has a high degree of purification, It has the characteristics of good absorption selectivity and low energy consumption, and methanol as an absorbent is cheap and easy to obtain, and its chemical stability and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/14C07C29/76C07C31/04
Inventor 张述伟管凤宝赵晋李燕杜亚明曲平
Owner DALIAN JIACHUN GAS PURIFICATION TECH DEV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap