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Method for producing dimethyl ether by catalyst distillation

A technology for catalytic distillation and catalytic distillation column, which is applied in the field of catalytic distillation to produce dimethyl ether and dimethyl ether, can solve the problems of increased production cost, many equipment, and many trays, and achieves low equipment investment and process optimization. , the effect of increased operating costs

Active Publication Date: 2013-09-04
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the above inventions, some of the methanol dehydration reaction and product separation are completely completed in a catalytic distillation tower, which requires a large number of trays and high equipment investment. At the same time, the operation of the catalytic distillation tower needs to take into account both the optimization of reaction conditions and the product dimethyl ether. Requirements for purity and methanol content in wastewater, less flexibility in operation; some share three distillation towers for methanol dehydration reaction and product separation, with many equipment, long process, high energy consumption and increased production cost

Method used

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  • Method for producing dimethyl ether by catalyst distillation

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Embodiment 1

[0027] The catalytic distillation tower includes a reaction section 3, a stripping section 4 and a tower still. The inner diameter of the tower body is 100 mm. The reaction section is equipped with 8 liters of catalyst and 20L Φ5×5mm stainless steel θ mesh ring packing. The catalyst layer and packing layer are alternately distributed; the stripping section is equipped with Φ5×5mm stainless steel θ mesh ring packing, and the effective height is 2.2 meters. The inner diameter of the second distillation tower 6 is 100 millimeters, equipped with Φ5 * 5mm stainless steel θ mesh ring packing, and the effective height is 3m.

[0028]Industrial methanol with a purity of 90.5% by weight is used as the reaction raw material. The catalyst is an acidic cation exchange resin. Feeding from the upper end of the reaction section, the steam at the top of the catalytic distillation tower is introduced into the bottom of the second distillation tower, and the liquid phase material in the bottom...

Embodiment 2

[0033] The inner diameter of the fixed-bed reactor is 100 mm, and 3 liters of catalyst are contained inside. The catalytic distillation column includes a reaction section, a stripping section and a tower still. The inner diameter of the tower body is 100 mm. The reaction section is equipped with 4 liters of catalyst and 12L Φ5×5mm stainless steel θ mesh ring packing. The catalyst layer and packing layer are alternately distributed; the stripping section is equipped with Φ5×5mm stainless steel θ mesh ring packing, and the effective height is 2.2 meters. The inner diameter of the second distillation tower is 100mm, and it is equipped with Φ5×5mm stainless steel θ mesh ring packing, and the effective height is 3m.

[0034] Industrial methanol with a purity of 99.5% by weight is used as the reaction raw material. The catalyst is an acidic cation exchange resin. Feed from the upper end of the reaction section, the steam at the top of the catalytic distillation tower is introduced...

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Abstract

The invention provides a method for producing dimethyl ether through catalytic distillation. The method comprises the following steps that: A) raw material is led into a catalytic distillation column, and at least one part of raw material reacts in a reaction zone of the catalytic distillation column to form dimethyl ether and water; B) steam on the top of the catalytic distillation column is led into the bottom of a distillation column, and material of which the main component is water is discharged from the bottom of the catalytic distillation column; and C) liquid-phase material on the bottom of the distillation column is taken as reflux liquid and led into the top of the catalytic distillation column, and the material of which the main component is dimethyl ether is obtained from the top of the distillation column. The method has the advantages of not only giving full play to the reaction and separation functions of the catalytic distillation column but also increasing the operation flexibility of the catalytic distillation column through equipment investment and operation cost as low as possible so as to optimize process flow.

Description

technical field [0001] The invention relates to the technical field of dimethyl ether production, in particular to the technical field of catalytic distillation to produce dimethyl ether. Background technique [0002] U.S. Patent USP 5684213 discloses a kind of by C 1-4 Process for the catalytic distillation of alcohols to the corresponding dialkyl ethers. The reaction section is located in the middle of the catalytic distillation tower, filled with mordenite catalyst, the rectification section and the stripping section are filled with packing, with methanol at a concentration of 40-100% as raw material, the pressure is 20-1000 psig, the temperature of the reaction section is 130-300°C, and hydrogen exists Under certain conditions, dimethyl ether with a purity of more than 99.9% can be obtained from the top of the tower. [0003] Chinese patent CN 1111231 discloses a method for preparing dimethyl ether by catalytic distillation. Catalytic distillation tower is made up of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/04C07C41/09B01J31/08
CPCY02P20/10
Inventor 吕爱梅郝兴仁李玉田
Owner CHINA PETROLEUM & CHEM CORP