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System and method for cracking of methyl tertiary butyl ether to prepare high purity isobutylene

A technology of methyl tert-butyl ether and pure isobutene, which is applied in the field of rectification, can solve the problems of high energy consumption in methanol water distillation, low purity of methanol products, and high consumption of multi-tower separations, so as to achieve energy saving, high yield, The effect of improving purity

Active Publication Date: 2014-08-20
SHANGHAI LANKE PETROCHEM ENG & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen from the above description that the existing MTBE cracking process for producing high-purity isobutene has the disadvantages of long process flow, large consumption of multi-tower separations, high energy consumption of low-concentration methanol water distillation, and low purity of methanol products when single-tower methanol is separated and recovered.

Method used

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  • System and method for cracking of methyl tertiary butyl ether to prepare high purity isobutylene
  • System and method for cracking of methyl tertiary butyl ether to prepare high purity isobutylene
  • System and method for cracking of methyl tertiary butyl ether to prepare high purity isobutylene

Examples

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Embodiment 1

[0072] Process flow

[0073] by Figure 5 The connection and installation of the middle pipeline to obtain the system of methyl tert-butyl ether cracking to produce high-purity isobutylene. The process flow of cracking reaction under normal pressure is as follows: image 3 As shown, the bottom of the methanol washing tower 6 is connected to the gas-liquid separation tank 3. After the methyl tertiary butyl ether raw material is refined by the refining tower 1 (the refining steps are as follows: the methyl tertiary butyl ether raw material is fed from an appropriate tray in the tower, and is separated through continuous vapor-liquid equilibrium, and finally purified The final methyl tert-butyl ether product is discharged from the top of the tower and sent to reactor 2, heavy component impurities are discharged from the tower kettle), and the purified methyl tert-butyl ether is heat exchanged in a heat exchanger (not shown) After that, it enters the reactor 2 (preferably a tubular ...

Embodiment 2

[0086] The other conditions are the same as in Example 1, except that the silica catalyst is used in the cracking reaction and the temperature of the gas-liquid separation tank is adjusted to 60°C.

Embodiment 3

[0088] Except that the oil-water ratio of the water scrubber was adjusted to 1.6:1, other conditions were the same as in Example 1.

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Abstract

The invention discloses a system for cracking of methyl tertiary butyl ether to prepare high purity isobutylene. The system includes: a refining tower; a reactor; a gas-liquid separation tank; a methanol recovery tower; a methanol washing tower; an isobutylene light component removal tower; and an isobutylene heavy component removal tower. The refining tower, the reactor, the gas-liquid separation tank, the methanol washing tower, the isobutylene light component removal tower, and the isobutylene heavy component removal tower are connected in order, the gas-liquid separation tank is connected to the methanol recovery tower, and the methanol washing tower, the gas-liquid separation tank and the methanol recovery tower form parallel connection. At the same time, the invention also provides a method for preparation of high purity isobutylene through cracking of methyl tertiary butyl ether. With the system and the preparation method provided by the invention, high purity isobutylene with purity of greater than 99.9% can be prepared, and methanol with purity of more than 99% can be obtained. Thus, investment and energy consumption of equipment are reduced, and loss of isobutylene is reduced.

Description

Technical field [0001] The invention belongs to the technical field of rectification, and specifically relates to a system and a method for preparing high-purity isobutene by cracking methyl tert-butyl ether. Background technique [0002] Isobutylene is an important basic organic chemical raw material and is widely used in the synthesis of various organic chemical raw materials and fine chemicals such as butyl rubber and polyisobutylene. At present, 70% of isobutylene products are used to synthesize butyl rubber and methacrylate. These two uses require high isobutylene purity. Not only does the isobutylene purity requirement exceed 99.7%, but also contains MTBE, methanol, water, etc. The impurity requirement is not more than 10ppm, and the impurity content of dimethyl ether is not more than 5ppm. [0003] Methyl tert-butyl ether (MTBE) cracking is an advanced and economically feasible technology to produce high-purity isobutylene. It is also the most widely used technical route f...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C1/20C07C31/04C07C29/00
Inventor 王战军马洪玺张文军李少云胡嫦娥
Owner SHANGHAI LANKE PETROCHEM ENG & TECH
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