Tail gas processing method in biodiesel processing process

A treatment method, biodiesel technology, applied in the direction of combustion method, separation method, chemical instrument and method, etc., can solve the problems of heavy sewage treatment load, poor treatment effect, large water consumption, etc., and achieve low environmental impact and low treatment cost Inexpensive, the effect of solving the excessive emission of exhaust gas

Active Publication Date: 2012-07-11
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of the prior art that the tail gas produced in the process of biodiesel processing by water sealing is not good, and the water consumption is large, and the sewage treatment load is large, and to provide a tail gas treatment effect The treatment method of tail gas produced in the process of biodiesel processing which is good and can effectively recover low carbon alcohol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example is used to illustrate the tail gas treatment method provided by the present invention.

[0026] will be 10m 3 (Standard state) tail gas is passed into 7L temperature and is the water of 35 ℃, and the speed that controls tail gas feeds makes passing time be 0.6 hour, and the content of methanol in the liquid phase product that obtains is 1% by weight. Collect the tail gas discharged after the tail gas is in contact with water, and deliquify the tail gas by gravity sedimentation in the dehydration tank. The liquid phase content in the exhaust gas after liquid was 0.2% by weight. The liquid obtained after dehydration is mixed with the liquid phase product obtained by contacting the tail gas with water, and then the liquid phase product is sent to a distillation tower for distillation at 126° C. and 0.05 MPa to obtain methanol and dimethyl ether. The volume of the obtained liquid methanol was 89.7 mL, and the recovery rate of methanol was 99.3%. Send the obt...

Embodiment 2

[0028] This example is used to illustrate the tail gas treatment method provided by the present invention.

[0029] will be 10m 3 (Standard state) tail gas was passed into 2.5L of water with a temperature of 33° C., the speed of tail gas feeding was controlled so that the feeding time was 0.7 hour, and the content of methanol in the obtained liquid phase product was 2.7% by weight. Collect the tail gas discharged after the tail gas is in contact with water, and deliquify the tail gas by gravity settlement in the dehydration tank. The liquid phase content in the tail gas after liquid was 0.5% by weight. The liquid obtained after dehydration is returned to the liquid phase product obtained by contacting the tail gas with water, and then the liquid phase product is sent to a methanol distillation tower for distillation at 126°C and 0.05 MPa to obtain methanol and dimethyl ether. The volume of the obtained liquid methanol was 89.1 mL, and the recovery rate of methanol was 98.6%....

Embodiment 3

[0031] This example is used to illustrate the tail gas treatment method provided by the present invention.

[0032] will be 10m 3 (Standard state) tail gas was passed into 5L of water with a temperature of 32° C., the speed of tail gas feeding was controlled so that the feeding time was 0.8 hour, and the content of methanol in the obtained liquid phase product was 1.4% by weight. Collect the tail gas discharged after the tail gas is in contact with water, and deliquify the tail gas by gravity sedimentation in the dehydration tank. The liquid phase content in the exhaust gas after liquid was 0.8% by weight. The liquid obtained after dehydration is returned to the liquid phase product obtained by contacting the tail gas with water, and then the liquid phase product is sent to a methanol distillation tower for distillation at 126°C and 0.05 MPa to obtain methanol and dimethyl ether. The volume of the obtained liquid methanol was 89.3 mL, and the recovery rate of methanol was 98...

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Abstract

The invention provides a tail gas processing method in a biodiesel processing process. The tail gas contains C1-C8 low-carbon alcohol and C1-C8 dialkyl ether. According to the invention, the tails gas contacts water, such that a liquid-phase product containing the C1-C8 low-carbon alcohol and at least partially the C1-C8 dialkyl ether is obtained; tail gas discharged after contacting the water is collected; liquid in the tail gas discharged after contacting the water is removed, and the liquid-removed gas is burned; with a condition for the tail gas to contact the water, the C1-C8 low-carbon alcohol content in the obtained liquid-phase product is at least 1% by weight. When the tails gas produced during a biodiesel processing process is processed by using the processing method provided by the invention, low-carbon alcohol in the tail gas can be effectively recovered, the influence of the burning product to the environment is small, a problem of excessive tail gas discharging in the biodiesel processing process can be effectively solved, and the processing cost is low.

Description

technical field [0001] The invention relates to a treatment method for tail gas produced in biodiesel processing. Background technique [0002] In the production process of biodiesel, especially in the process of producing biodiesel using SRCA technology, it usually needs to go through the esterification reaction process of raw material oil and low-carbon alcohol, the recovery of low-carbon alcohol, and the refining of biodiesel products. operate. Wherein, the refining of the biodiesel product generally includes four operation units of water washing, degassing, flashing and acid reduction, and a large amount of tail gas will be produced in the process, and the tail gas contains C1-C8 low-carbon alcohols and C1- Organic substances such as C8 dialkyl ethers. In order to prevent the tail gas containing organic matter from being discharged into the atmosphere and causing environmental pollution, the prior art treatment method for tail gas usually adopts water sealing, that is,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18F23G7/06
Inventor 郑长波刘强王先国史国强张庆英豆占营
Owner CHINA NAT OFFSHORE OIL CORP
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