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Method for preparing tert-butanol by isobutene hydration

A technology of isobutene hydration and tert-butanol, applied in the direction of hydroxyl addition preparation, chemical instruments and methods, organic compound/hydride/coordination complex catalyst, etc., can solve the difficulty of reactant separation, increase side reactions, and reaction temperature Advanced problems, to achieve the effect of reducing equipment investment and operating costs, increasing solvency, and mild reaction conditions

Active Publication Date: 2008-03-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using an inorganic acid solution as a catalyst, although the catalytic activity is high, there is serious corrosion to the equipment and increased side reactions, which not only increases the cost of the equipment but also causes difficulties in the separation of reactants
When using strongly acidic cation exchange resin and acidic solid as a catalyst, there are problems such as low hydration activity, high reaction temperature (120-200°C), short catalyst life, low conversion rate of isobutylene, and decomposition of TBA at high temperature.

Method used

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  • Method for preparing tert-butanol by isobutene hydration
  • Method for preparing tert-butanol by isobutene hydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] At 20°C, add 1.0632g of ionic liquid [Bmim]HSO into a 30ml reactor 4 10ml of aqueous solution, through N 2 After passing the leak test, vacuumize, and then feed isobutene gas to make the pressure reach 0.15MPa, and react for 4 hours at a reaction temperature of 70°C and a rotation speed of 600r / min. The conversion rate of isobutene is 81.5%. The choice of tert-butanol The sex is 99.5%.

Embodiment 2

[0016] With embodiment 1, ionic liquid is changed into [Bmim] H 2 PO 4 , the conversion rate of isobutene was 82.6%, and the selectivity of tert-butanol was 99.3%.

Embodiment 3

[0018] With embodiment 1, ionic liquid is changed into [Bmim] HSO 4 and [Bmim] H 2 PO 4 The mixture, its mass ratio is 1:1, the conversion rate of isobutene is 81.8%, the selectivity of t-butanol is 99.6%.

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Abstract

The present invention relates to a preparation method for tert-butyl alcohol by the hydration of 2-methylpropene, which is characterized in that the catalyzer used in the method is an ion liquid; the catalyzer has the advantages of not easy to be volatized, much better environment and much softer reaction condition and so on. The method can make the conversion ratio for 2-methylpropene reach up to 80-83 percent and the selectivity for tert-butyl alcohol reach up to 99-100 percent under the soft reaction conditions. Compared with the prior technical method, the present invention can simplify the technics flow, decrease the equipment investments and operations cost and decrease the environment pollution.

Description

Technical field: [0001] The invention relates to a method for preparing tert-butanol by using isobutene and water as raw materials and using an ionic liquid as a catalyst. Background technique: [0002] Tert-butanol (TBA) is an important product in large-scale industrial production. Because it is a low-boiling solvent, it is widely used in plastics, coatings, detergents, medicines, insecticides and gasoline additives. It can also be used as It is used as an intermediate for the preparation of methyl methacrylate, and is an important raw material for the fine chemical industry and organic synthesis industry. [0003] There are multiple methods for the addition reaction of isobutylene and water to generate tert-butanol under various catalyst conditions, such as the most common useful sulfuric acid as catalyst, acidic cation exchange resin as catalyst (JP137906 / 75), and acidic solid as catalyst ( 200410057863.9), the concentrated heteropolyacid with Keggin structure as catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/12C07C29/04B01J31/02
Inventor 张锁江沈兴王蕾闫瑞一孙剑杨普
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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