Device and method for removing methanol from methyl tert-butyl ether cracking product

A technology of methyl tert-butyl ether and pyrolysis products, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, etc. It can solve problems such as insufficient gas-liquid contact, unsatisfactory mass transfer effect, and short contact time. Achieve full absorption effect, reduce the circulation of absorption liquid, and increase the concentration

Inactive Publication Date: 2018-06-15
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fillers used in the rotating packed bed are usually corrugated wire mesh, mesh metal, metal foam, Raschig rings and other fillers. Although they provide a place for gas-liquid contact, they cannot solve the problem of uniform distribution of liquid, and for some reactions In terms of gas-liquid contact is not enough, the contact time is short, resulting in unsatisfactory mass transfer effect

Method used

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  • Device and method for removing methanol from methyl tert-butyl ether cracking product
  • Device and method for removing methanol from methyl tert-butyl ether cracking product
  • Device and method for removing methanol from methyl tert-butyl ether cracking product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] like Figure 1~5 Shown, a kind of device that removes methanol from the cracking product of methyl tert-butyl ether comprises multistage gas flow shearing cross-flow bed 16, and the bottom of multistage gas flow shearing cross flow bed 16 sides is provided with gas inlet 1, through Into the cracked gas, the top of the multi-stage air flow shearing cross-flow bed 16 is provided with a gas outlet 10, which is connected with the purification gas section, and the top of the side of the multi-stage air flow shearing cross-flow bed is provided with a liquid inlet 11, which is used to feed the absorption liquid. The bottom of the multi-stage air shearing cross-flow bed 16 is provided with a liquid outlet 12 for discharging the absorption liquid, the liquid inlet is connected to the pump, and the liquid outlet 11 of the multi-stage air shearing cross-flow bed is connected to the methanol rich liquid tank 18;

[0049] The multi-stage air shear cross-flow bed 16 includes a liquid...

Embodiment 1

[0060] MTBE pyrolysis product composition (mass fraction): isobutene: 97.4%; methanol: 1.44%; dimethyl ether: 1.13%; the rest is a trace of MTBE and tertiary alcohol.

[0061] Turn on the motor, adjust the rotor of the multi-stage air-shear cross-flow bed to 1800r / min, turn on the lean liquid pump, adjust the liquid flow meter to control the flow rate of water solvent to 30L / h, and the methanol aqueous solution enters the multi-stage air-shear cross-flow bed from the liquid inlet , the MTBE cracking product containing 1.44% methanol is passed through the gas inlet into the multi-stage gas flow shearing cross-flow bed, and the gas volume is adjusted to 3m 3 / h, the liquid is evenly distributed and sprayed into the upper and lower layers of packing through the upper and lower liquid distributors, and moves outward along the inner layer of the packing under the action of huge centrifugal force. , to remove methanol gas, the purified gas from the gas outlet is passed into the purif...

Embodiment 2

[0063] The technological process is the same as that of Example 1, and the factors investigated in Example 2 are different gas flow rates, liquid flow rates, and rotor speeds, and the content (mass fraction) of methanol at the gas outlet of the multistage gas flow sheared cross-flow bed is analyzed. The results are shown in Table 1.

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PUM

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Abstract

The invention discloses a device and a method for removing methanol from a methyl tert-butyl ether cracking product. The MTBE cracking product and absorption liquid undergo cross flow-counterflow contact in a multistage airflow shear cross-flow bed; under the shear action of high-speed rotating filler, cracked gas and the absorption liquid are dispersed, coalesced and redispersed for multiple times, so that multistage absorption is realized; cracking gas is introduced to a gas inlet in the side bottom of a multistage airflow shear cross flow bed; a gas outlet in the top of the multistage airflow shear cross flow bed is connected with a purified gas section; the absorption liquid is introduced to a liquid inlet in the side top of the multistage airflow shear cross flow bed; a liquid outletin the bottom of the multistage airflow shear cross flow bed is used for draining the absorption liquid; the liquid inlet is connected with a pump; the liquid outlet of the multistage airflow shear cross flow bed is connected with a liquid-rich tank; the multistage airflow shear cross flow bed comprises a liquid distributor, a liquid collecting and redistributing device, a rotor, a stator, a driving device and a casing. According to the equipment, the gas and the absorption liquid generally make counterflow contact, so that a gas-liquid mass transfer propulsion force is greater, the purification degree of the cracking gas is improved, and the concentration of methanol in the rich solution and the utilization rate of the absorption liquid are improved.

Description

technical field [0001] The invention relates to a device and method for removing methanol from methyl tert-butyl ether cracking products, belonging to the technical field of methanol removal. Background technique [0002] Isobutene is a very important chemical raw material. According to the difference in purity, it is mainly divided into mixed fraction isobutene and high-purity isobutene in a mixed state. The isobutene content in mixed distillate isobutene is generally 44%~49%, and high-purity isobutene usually refers to isobutene products with isobutene purity higher than 99.5%. High-purity isobutylene is mainly used in the production of butyl rubber, polyisobutylene, methacrylonitrile, tert-butyl mercaptan, tert-butylphenol, antioxidants, tert-butylamine, and a series of downstream products that are widely used, have high added value, and are urgently needed in China. As countries around the world accelerate the development of high value-added fine chemical products, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/18
CPCB01D53/1487B01D53/1493B01D53/18B01D2252/2021
Inventor 袁志国刘有智祁贵生焦纬洲张君高璟张栋铭杜杰
Owner ZHONGBEI UNIV
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