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Method for preparing dimethyl ether, low carbon olefin hydrocarbon with combination of methanol dehydration catalytic pyrolysis

A catalytic cracking and methanol dehydration technology, which is applied in the production of hydrocarbons from oxygen-containing organic compounds, dehydration of hydroxyl-containing compounds to prepare ethers, ether preparations, etc., can solve the problems of low coke formation rate, reduction, and alkane content reduction

Active Publication Date: 2012-12-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The coke formation rate of this method is low, and the C1-C4 alkane content in the product is reduced, especially the propane content in the olefin product is significantly reduced

Method used

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  • Method for preparing dimethyl ether, low carbon olefin hydrocarbon with combination of methanol dehydration catalytic pyrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The purity of methanol in the methanol feedstock is 99.5% by weight, and the hydrocarbon feedstock is vacuum gas oil (VGO), the properties of which are shown in Table 1. The code name of the catalyst used in this example is MTD-1 (containing 20% ​​by weight of ZSM-5 molecular sieve, 10% by weight of USY molecular sieve, and the balance as a carrier, all based on the total weight of the catalyst).

[0058] The gaseous methanol feedstock enters the fluidized bed reactor and contacts with the MTD-1 catalyst. It reacts at a temperature of 280°C, a pressure of 0.6MPa, a weight ratio of catalyst to methanol feedstock (agent to alcohol ratio) of 30, and a reaction time of 8.1 seconds. The stream is separated to obtain a product stream composed mainly of coke catalyst and dimethyl ether. The composition of the material is shown in Table 2. The material is directly sent to the stripper of the catalytic cracking unit without separation to react with the hot catalyst. The coke deposi...

Embodiment 2

[0062] The purity of methanol in the methanol feedstock is 95% by weight, and the hydrocarbon feedstock is vacuum gas oil (VGO), whose properties are shown in Table 1. The code name of the catalyst used in this example is MTD-2 (containing 15% by weight SAPO molecular sieve, 10% by weight ZSM-5 molecular sieve, 10% by weight USY molecular sieve, the balance is the carrier, all based on the total weight of the catalyst).

[0063] The gaseous methanol feedstock enters the fluidized bed reactor and contacts with the MTD-1 catalyst, and reacts under the conditions of a temperature of 320°C, a pressure of 0.3MPa, a weight ratio of catalyst to methanol feedstock (reagent ratio) of 2.5, and a reaction time of 3.2 seconds. The stream is separated to obtain a product stream composed mainly of coke catalyst and dimethyl ether. The composition of the material is shown in Table 2. The material is directly sent to the stripper of the catalytic cracking unit without separation to react with the...

Embodiment 3

[0067] The purity of methanol in the methanol feedstock is 99.5% by weight, and the hydrocarbon feedstock is vacuum gas oil (VGO), the properties of which are shown in Table 1. The code name of the catalyst used in this example is MTD-1 (containing 20% ​​by weight of ZSM-5 molecular sieve, 10% by weight of USY molecular sieve, and the balance as a carrier, all based on the total weight of the catalyst).

[0068] The gaseous methanol feedstock enters the fluidized bed reactor and contacts with the MTD-1 catalyst. It reacts under the conditions of a temperature of 360°C, a pressure of 0.4MPa, a weight ratio of catalyst to methanol feedstock (agent to alcohol ratio) of 1, and a reaction time of 5.4 seconds. The stream is separated to obtain a product stream composed mainly of coke catalyst and dimethyl ether. The composition of the material is shown in Table 2. The material is directly sent to the bed reactor of the catalytic cracking unit without separation to react with the hot cat...

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Abstract

A method for preparing dimethyl ether and low-carbon olefin by combining methanol dehydration and catalytic cracking is provided. The method comprises the steps as follows: methanol raw material is in contact with mesopore molecular sieve-containing catalyst, and the reacted stream is separated to obtain carbon deposited catalyst and a reaction stream mainly containing dimethyl ether; hydrocarbonraw material is in contact with mesopore zeolite-containing catalyst, and the reacted stream is separated to obtain catalyst to be regenerated and reaction oil gas, and the oil gas is further separated to obtain products such as gas rich in low-carbon olefin, gasoline, etc.; The reaction stream mainly containing dimethyl ether is partially or completely introduced into a catalytic cracking device, and is in contact with the catalyst to be converted into low-carbon olefin; and the carbon deposited catalyst is partially returned to the catalytic cracking device, the catalyst to be regenerated is completely introduced into a regenerator and regenerated by burning coke; and the regenerated catalyst is partially or completely returned to the catalytic cracking device after being degassed. The method can reasonably employ surplus heat of hydrocarbon catalytic cracking, solve the problems on methanol conversion catalyst and heat supply, and ensure that methanol is continuously converted intodimethyl ether and low-carbon olefin.

Description

Technical field [0001] The invention relates to a method for producing dimethyl ether from methanol. More specifically, the invention belongs to a method for simultaneously producing dimethyl ether and low-carbon olefins (C2-C4 olefins) through the combined catalytic conversion of hydrocarbons. Background technique [0002] The production method of dimethyl ether (DME) has one-step method and two-step method. The one-step method is to synthesize dimethyl ether from the raw gas at one time; the two-step method is to synthesize methanol from the synthesis gas, and then dehydration to produce dimethyl ether. [0003] The two-step method is carried out in two steps, that is, methanol is first synthesized from synthesis gas, and methanol is dehydrated to dimethyl ether under acid catalysis. The two-step synthesis of dimethyl ether is currently the main process for the production of dimethyl ether at home and abroad. This method uses refined methanol as a raw material, has less by-produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/02C07C41/09C07C43/04
CPCY02P20/584
Inventor 谢朝钢朱根权孙新孙益群杨义华李正舒兴田龙军张久顺
Owner CHINA PETROLEUM & CHEM CORP
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