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Production method and production system for preparing isoprene from methyl tert-butyl ether and formaldehyde by utilizing catalyst for carbon deposition

A technology of methyl tertiary butyl ether and production method, applied in chemical instruments and methods, catalysts, carbon compound catalysts, etc., can solve the problems of uncontrollable, complicated reaction process, uncontrollable carbon content and carbon composition, etc.

Active Publication Date: 2019-10-08
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is also a poisoned catalyst in the reaction process, and it is accompanied by a complex and uncontrollable carbon deposition reaction (the carbon amount and carbon composition are uncontrollable)
Therefore, although the production of isoprene with MTBE instead of isobutene has certain advantages, it also makes the reaction process more complicated and uncontrollable

Method used

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  • Production method and production system for preparing isoprene from methyl tert-butyl ether and formaldehyde by utilizing catalyst for carbon deposition
  • Production method and production system for preparing isoprene from methyl tert-butyl ether and formaldehyde by utilizing catalyst for carbon deposition
  • Production method and production system for preparing isoprene from methyl tert-butyl ether and formaldehyde by utilizing catalyst for carbon deposition

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Experimental program
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Effect test

Embodiment 1

[0169] see figure 1 , figure 1 A simplified process flow diagram of the isoprene production system provided by the present invention.

[0170] On the riser reactor, with MoP / SiO 2 Be catalyzer, catalyst circulation rate is 3kg / h, and reactor temperature is 320 ℃, and MTBE enters reactor from feed inlet 1, and feed rate is 10kg / h, and heating section 1 temperature is 280 ℃, and catalyzer and MTBE contact time ( The time from feed port 1 to feed port 3) is 1.4s, the pre-coke content of the catalyst is 2.6wt%, the auxiliary gas flow rate is 50L / h, the formaldehyde feed rate is 2kg / h, and the contact time between the catalyst and aldehydes and alkenes It is (the time from feed port 3 to the separator) 1.0s, the regenerator temperature is 550°C, the air flow rate is 3000L / h, the residence time of the catalyst in the regenerator is 40min, and the carbon content of the regenerated catalyst is 4.6wt%. , the reaction continued for 10h, the average conversion rate of MTBE was 96%, th...

Embodiment 2

[0180] On the riser reactor, with CrP / SiO 2 It is a catalyst, the catalyst circulation rate is 5.8kg / h, the reactor temperature is 350°C, MTBE enters the reactor from the feed port 1, the feed rate is 8kg / h, the temperature of the heating section I is 300°C, the contact time between the catalyst and MTBE (the time from feed port 1 to feed port 3) is 1.6s, the pre-coke content of the catalyst is 1.9wt%, the auxiliary gas flow rate is 0L / h, the formaldehyde feed rate is 1.2kg / h, the catalyst and aldehyde, olefin The contact time is (the time from feed port 3 to the separator) 1.0s, the regenerator temperature is 500°C, the air flow rate is 3200L / h, the residence time of the catalyst in the regenerator is 40min, and the carbon content of the regenerated catalyst is 5.3 wt%, the reaction continued for 10h, the average conversion rate of MTBE was 92%, the average selectivity was 86%, the average conversion rate of formaldehyde was 95%, and the average yield of product isoprene was ...

Embodiment 3

[0182] On the riser reactor, with Mo-V-P / SiO 2 It is a catalyst, the catalyst circulation rate is 5.5kg / h, the reactor temperature is 290°C, MTBE enters the reactor from the feed port 1, the feed rate is 10kg / h, the heating section I temperature is 250°C, the catalyst and MTBE contact time (the time from feed port 1 to feed port 3) is 1.8s, the pre-coke content of the catalyst is 3.5wt%, the auxiliary gas flow rate is 100L / h, the formaldehyde feed rate is 1.8kg / h, the catalyst and aldehyde, alkene The contact time is (the time from feed port 3 to the separator) 2s, the regenerator temperature is 520°C, the air flow rate is 2600L / h, the residence time of the catalyst in the regenerator is 60min, and the carbon content of the regenerated catalyst is 5.2wt %, the reaction continued for 10h, the average conversion rate of MTBE was 89%, the average selectivity was 85%, the average conversion rate of formaldehyde was 96%, and the average yield of product isoprene was 58% (in formald...

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Abstract

The invention provides a production method for isoprene. The production method comprises the following steps: subjecting a solid acid catalyst and methyl tert-butyl ether to a continuous flow pre-reaction so as to obtain a reaction system and a carbon pre-deposition solid acid catalyst; and introducing formaldehyde gas into the reaction system obtained in the previous step, and carrying out a continuous flow reaction under the action of the carbon pre-deposition solid acid catalyst so as to obtain the isoprene. The production method provided by the invention fully and reasonably controls and utilizes carbon deposition, can generate a carbon positive active center by utilizing deposited carbon with a specific composition to promote a reaction, can effectively cover the surface strong acid sites of a catalyst, inhibits the decomposition reaction of formaldehyde molecules, and reduces side reactions in which a product namely the isoprene participates, so the efficiency of the reaction isimproved; and the carbon deposition amount of the catalyst is reduced.

Description

technical field [0001] The present invention relates to the technical field of synthesizing isoprene by ether-aldehyde method, and relates to a production method and production system of isoprene, in particular to a method for preparing isoprene by utilizing catalyst carbon-deposited methyl tert-butyl ether and formaldehyde production methods and production systems. Background technique [0002] Isoprene is an important chemical raw material. The most important application is the production of isoprene rubber, liquid isoprene rubber, butyl rubber, etc. It is also widely used in the synthesis of high value-added fine chemicals, such as the synthesis of isoprene chloride, Methylheptenone, Linalool, Citral, Myrcene, Lavenderol, Vitamins A, E, K, Pyrethroids. At present, the production methods of isoprene mainly include physical method and chemical method. The physical method uses the by-product C5 fraction of naphtha cracking to produce ethylene as raw material, and uses diff...

Claims

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Application Information

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IPC IPC(8): C07C2/86C07C11/18C07C1/20C07C11/09
CPCC07C1/20C07C2/867C07C2527/188C07C2527/19C07C2527/199C07C11/09C07C11/18Y02P20/584
Inventor 祁彦龙白晨曦崔龙代全权董巍
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI