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Process for preparing dimethyl ether by vapor catalytic dehydration of methanol with high-activity dipping-type heteropoly acid as catalyst

A process technology and catalyst technology, which are used in the dehydration of hydroxyl-containing compounds to prepare ethers, catalyst carriers, catalysts for physical/chemical processes, etc., can solve problems such as no industrial reports, no breakthroughs, and zigzag fluctuations in catalyst bed temperature. The effect of reducing side reactions, reducing the consumption of raw materials, etc., and reducing product costs

Inactive Publication Date: 2009-07-01
汪荣华 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the multi-stage quenching reactor has inevitable defects: in the multi-stage quenching reactor, the temperature of the catalyst bed fluctuates in a zigzag shape
Although more researches have been carried out at home and abroad since the 1980s, and industrial tests of different scales have been carried out, no breakthroughs have been made, and no industrialization reports have been seen.

Method used

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  • Process for preparing dimethyl ether by vapor catalytic dehydration of methanol with high-activity dipping-type heteropoly acid as catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The composition (mass percentage) of catalyst is:

[0079] ——Carrier: molecular sieve 82.2%

[0080] ——Catalyst active component: heteropolyacid, 13.0%

[0081] ——Promoter: lanthanum cerium mixed rare earth oxide 1.8%

[0082] ——Molding agent: 3.0%

[0083] The catalyst is extruded, impregnated, dried and calcined.

[0084] Industrial methanol (≥98.5%) enters the system at a feed rate of 89kg / h, and reacts in a tube-and-tube heat-exchange homogeneous temperature reactor filled with an efficient new impregnated heteropolyacid catalyst. The reaction temperature is 180°C; the reaction pressure 1.0MPa; methanol mass space velocity (methanol mass / catalytic mass) 1.0h -1 ; Methanol conversion 90%; selectivity ≥ 99.8%. The reactor outlet consists of:

[0085] DME (dimethyl ether) 56.7kg / h

[0086] CH 3 OH (methanol) 8.8kg / h

[0087] h 2 O (water) 23.5kg / h

[0088] After separation by three towers (light component separation tower, dimethyl ether rectification tower, a...

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Abstract

The invention provides a highly active impregnated heteropolyacid catalyst for gas-phase catalytic dehydration of methanol to produce dimethyl ether. Pack the highly active impregnated heteropolyacid catalyst in a tube-and-tube heat-exchanging homogeneous temperature reactor (or multi-stage chilled shock reactor) for gas-phase catalytic dehydration of methanol, and use three towers (light component separation tower, two Dimethyl ether rectification tower, methanol rectification tower) separation process to continuously produce dimethyl ether technology.

Description

technical field [0001] The present invention relates to the preparation method of dimethyl ether. It specifically relates to a method of using methanol as a raw material, using a highly active impregnated heteropoly acid (Heteropoly Acid, HPA) catalyst packed in a tube heat exchange type uniform temperature reactor (or multi-stage cold shock reactor) for methanol gas phase Catalyzed dehydration reaction to generate dimethyl ether, the gas leaving the reactor is cooled and then separated by three towers (light component separation tower, dimethyl ether rectification tower, methanol rectification tower) to continuously produce dimethyl ether technology. Background technique [0002] Dimethyl ether (Dimethy Ether, abbreviated as DME) is a colorless, non-toxic gas at normal temperature and pressure, which can be compressed into a liquid. Dimethyl ether is an important organic chemical raw material and chemical intermediate, which can be used in aerosols, refrigerants, alkylatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/09C07C43/04B01J27/00B01J32/00
Inventor 汪荣华张云清何林清刘惠
Owner 汪荣华