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Method for producing dimethyl ether by catalytic cracking coupling methanol dehydration

A catalytic cracking and methanol dehydration technology, which is applied to the preparation of ether by dehydration of hydroxyl-containing compounds, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problems of insufficient heat balance and large heat of vaporization of methanol

Active Publication Date: 2008-06-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the dehydration reaction of methanol needs to be completed at a certain temperature. During the reaction process, the heat of vaporization of methanol is very large, and the heat released by methanol itself is not enough to maintain the heat balance of the methanol dehydration process.

Method used

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  • Method for producing dimethyl ether by catalytic cracking coupling methanol dehydration
  • Method for producing dimethyl ether by catalytic cracking coupling methanol dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The purity of methanol in the methanol raw material is 99.5% by weight, and the hydrocarbon raw material is vacuum gas oil (VGO), and its properties are shown in Table 1. The code name of the catalyst used in this example is MTD-1 (contains 30% by weight of USY zeolite, 5% by weight of ZSM-5 zeolite, and the rest is carrier, all based on the total weight of the catalyst).

[0056] The gaseous methanol raw material enters the combined reactor of the short riser and the fluidized bed to contact with the fresh MTD-1 catalyst. At a temperature of 250° C. and a pressure (gauge pressure) of 0.1 MPa, the weight ratio (agent-alcohol ratio) of the catalyst to the methanol raw material is 2.5, weight hourly space velocity 3.0h -1 Reaction under the conditions, reactant flow is separated to obtain carbon deposition catalyst and product flow, and this product flow is further separated to obtain the target product dimethyl ether, product distribution is as shown in table 2, and exce...

Embodiment 2

[0061] The purity of methanol in the methanol raw material is 90.0% by weight, and the hydrocarbon raw material is VGO, and its properties are shown in Table 1. The code name of the catalyst used in this example is MTD-2 (containing 35% by weight of USY zeolite, and the balance is a carrier, all based on the total weight of the catalyst)

[0062] The gaseous methanol raw material enters the methanol reactor and contacts with the MTD-2 catalyst, at a temperature of 280°C, a pressure (gauge pressure) of 0.1MPa, a weight ratio of catalyst to methanol raw material (agent-alcohol ratio) of 0.5, and a weight hourly space velocity of 20h -1 Reaction under the conditions, reactant flow is separated to obtain carbon deposition catalyst and product flow, and this product flow is further separated to obtain the target product dimethyl ether, product distribution is as shown in table 2, and excess methanol is returned to methanol reactor; carbon deposition catalyst is divided into Two par...

Embodiment 3

[0067] The purity of methanol in the methanol raw material is 95.0% by weight, and the hydrocarbon raw material is VGO, and its properties are shown in Table 1. The code name of the catalyst used in this example is MTD-3 (containing 30% by weight of USY zeolite, 5% by weight of Beta zeolite, and the balance being carrier, all based on the total weight of the catalyst).

[0068] The gaseous methanol raw material enters the methanol reactor and contacts with the MTD-3 catalyst. At a temperature of 230°C and a pressure (gauge pressure) of 0.1MPa, the weight ratio of the catalyst to the methanol raw material (agent-alcohol ratio) is 6, and the weight hourly space velocity is 0.1h -1 Reaction under the conditions, reactant flow is separated to obtain carbon deposition catalyst and product flow, and this product flow is further separated to obtain the target product dimethyl ether, product distribution is as shown in table 2, and excess methanol is returned to methanol reactor; carbo...

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Abstract

The invention relates to a method to produce dimethyl ether through dehydration of methanol by catalytic cracking and coupled reaction. Methanol material contacts with catalyst containing fresh Y series zeolite, the reacting substances flow is separated, and carbon deposited catalyst and the target products dimethyl ether is obtained, and the carbon deposited catalyst returns to a methanol reactor and / or a catalytic cracking device. The alkyl material contacts with the catalyst containing Y series zeolite in the catalytic cracking reactor, the reacting substance flow is separated, and catalyst to be generated and reacting oil and gas are obtained, and the oil and gas is further separated to prepare gas and gasoline products; the catalyst to be generated completely enters a regenerator for scorching and regeneration, the regenerated catalyst completely returns to the catalytic cracking reactor, or a part of regenerated catalyst returns to the catalytic cracking reactor while the residual regenerated catalyst and the fresh catalyst return to the methanol reactor together. The method of the invention not only rationally utilizes the excessive heat energy during the catalytic transformation process, but also solves the heat supplying problem of methanol transformation, thus ensuring that methanol is continuously transformed into dimethyl ether.

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 producing dimethyl ether from methanol through combined catalytic conversion of hydrocarbons. Background technique [0002] There are one-step and two-step methods for the production of dimethyl ether (DME). The one-step method refers to the one-time synthesis of dimethyl ether from the raw material gas; the two-step method is to synthesize methanol from the synthesis gas, and then dehydrate to obtain 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 under acid catalysis to produce dimethyl ether. The two-step synthesis of dimethyl ether is the main process for the production of dimethyl ether at home and abroad. This method uses refined methanol as a raw material, with few by-products of dehydration reaction, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/09B01J29/08
CPCY02P20/584
Inventor 朱根权谢朝钢龙军张久顺付强慕旭宏罗一斌孙新孙益群杨义华舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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