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Recovery method for isobutene in cracking process of methyl tert-butyl ether

A technology of methyl tert-butyl ether and isobutene, which is applied in the field of separation and recovery of isobutene, can solve the problems of no industrial use value and resource waste of light components at the top of the light removal tower, so as to improve resource utilization, avoid waste, and reduce production cost effect

Active Publication Date: 2013-11-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The light component at the top of the light removal tower has no industrial utilization value and can only be used as fuel, resulting in a great waste of resources

Method used

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  • Recovery method for isobutene in cracking process of methyl tert-butyl ether
  • Recovery method for isobutene in cracking process of methyl tert-butyl ether
  • Recovery method for isobutene in cracking process of methyl tert-butyl ether

Examples

Experimental program
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Effect test

Embodiment 1

[0027] With comparative example 1, the difference is that a static mixer is arranged at the bottom of the first water washing tower, and the stream comprising dimethyl ether and isobutylene at the top of the light removal tower after decompression is mixed with the back material and water in a static state. Mix well in the container, and then pass into the first water washing tower. See Table 2 and Table 3 for the data.

Embodiment 2

[0031] The same as Comparative Example 2, the difference is that a static mixer is arranged at the bottom of the first water washing tower, and the stream comprising dimethyl ether and isobutylene at the top of the light removal tower after decompression is statically mixed with the back material and water Mix well in the container, and then pass into the first water washing tower. See Table 5 and Table 3 for the data.

[0032] table 3

[0033]

[0034] It can be known from the data in the table that the separation and recovery of isobutene according to the method provided by the present invention increases the output of isobutene and improves the economic benefit under the premise of ensuring that the isobutene with a purity greater than 99.9% is obtained at the bottom of the light removal tower.

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Abstract

The invention discloses a recovery method for isobutene in the cracking process of methyl tert-butyl ether for preparation of isobutene. The method comprises the following steps: step 1) mixing light components obtained at the top of a light component-removing tower and containing dimethyl ether and isobutene with reacted materials and water; step 2) introducing a mixed material obtained in the step 1) into a first water scrubber to obtain a water phase at the bottom of the water scrubber and an oil phase at the top of the water scrubber; step 3) introducing the water phase obtained in the step 2) into a methanol recovery tower to recover methanol and to obtain a material flow containing dimethyl ether at the top of the recovery tower; step 4) introducing the oil phase obtained in the step 2) into a rectifying tower and allowing components at the top of the rectifying tower to enter into a second water scrubber so as to obtain a water phase at the bottom of the second water scrubber and an oil phase at the top of the second water scrubber; and step 5) introducing the oil phase obtained in the step 4) into the light component-removing tower so as to obtain pure isobutene at the bottom of the light component-removing tower and returning light components containing dimethyl ether and isobutene obtained at the top of the light component-removing tower to the step 1). The method provided by the invention has the advantages of simple process flow, easy operation, capacity of complete recovery of isobutene, reduction of production cost and substantial improvement of economic benefits of an apparatus.

Description

technical field [0001] The invention relates to a method for recovering isobutene, in particular to a method for separating and recovering isobutene in the process of producing isobutene by cracking methyl tert-butyl ether. Background technique [0002] The process of producing high-purity isobutene from methyl tert-butyl ether (MTBE) usually adopts a five-column separation process, namely, the first water washing tower, methanol recovery tower, isobutene rectification tower (weight removal tower), second water washing tower and isobutene Refining tower (light removal tower). Among them, the function of the weight removal tower is to remove unreacted MTBE, carbon five and isobutylene dimer in the product, and the function of the weight removal tower is to remove the light component dimethyl ether in the product isobutylene, while the first and second water washing The function of the tower is to wash away the methanol in the reacted material. [0003] In the existing MTBE ...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C7/04C07C7/10
Inventor 贾志光栗同林杨怀军庄书红李正艳赵岚刘珺
Owner CHINA PETROLEUM & CHEM CORP
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