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

A technology of dimethyl ether and catalyst, which is applied in the field of preparation of dimethyl ether, can solve the problems of no industrialization report, no breakthrough, zigzag fluctuation of catalyst bed temperature, etc., and achieve reduction of side reactions, reduction of consumption of raw materials, etc. Product Cost Effects

Inactive Publication Date: 2006-09-27
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 enther by vapour catalytic dehydration of methanol with high-activity dipping-type heteropoly acid as catalyst

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Experimental program
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Effect test

Embodiment 1

[0063] The composition (mass percentage) of catalyst is:

[0064] ——Carrier: molecular sieve 82.2%

[0065] ——Catalyst active component: heteropolyacid, 13.0%

[0066] ——Promoter: lanthanum-cerium mixed rare earth oxide 1.8%

[0067] ——Molding agent: 3.0%

[0068] The catalyst is extruded, impregnated, dried and calcined.

[0069] 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:

[0070] DME (dimethyl ether) 56.7 kg / h

[0071] CH 3 OH (methanol) 8.8 kg / h

[0072] h 2 O (water) 23.5 kg / h

[0073] After separation by three towers (light component separation tower, dimethyl ether rectification tow...

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Abstract

The invention discloses a high-activity dipping style heteropoly acid accelerant for methyl alcohol gaseous phase catalytic dehydration to produce dimethyl ether, which comprises the following steps: filling high-activity dipping style heteropoly acid accelerant in tubular recuperative temperature catalyst case (or multistage condensation style reactor) to carry on carbinol gas phase catalytic dehydration reaction; using three towers (light component knockout tower, dimethyl ether fractionating tower, carbinol fractionating tower) separating flow process and continuous production dimethyl ether craft technique.

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 Applications(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