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Process for producing isoprene

A technology of isoprene and isobutylene, applied in the field of producing isoprene, can solve the problem of unsatisfactory supplement of heat

Inactive Publication Date: 2006-05-03
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still not satisfactory as a supplement to the heat necessary for producing isoprene, so there is still room for improvement before industrial application

Method used

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  • Process for producing isoprene
  • Process for producing isoprene

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Experimental program
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Embodiment 1-8

[0097] The reaction conditions in the reactor are that the reaction temperature is 175-178° C., the reaction pressure is 1.52 MPa, and the rotational speed of the stirring blade is 48-55 rpm.

[0098] In the reactor (internal volume 120L), a 2.5% phosphoric acid aqueous solution (60L) was supplied, and under the above reaction conditions, 46% by mass aqueous formalin at a rate of 3.24kg / hour, isobutylene at a rate of 17.7kg / hour, The reaction was started by continuously supplying tert-butanol at a rate of 6.02 kg / hour and water at a rate of 9.08 kg / hour to the reactor.

[0099] 24 hours after the start of the reaction, by controlling figure 2 The removal amount of the high-boiling by-products in the high-boiling by-product separation tank 4 of the shown reaction equipment controls the concentration of the high-boiling by-products in the reaction mixture to the following predetermined value, wherein a center for taking out a by-product is formed at the bottom center of the rea...

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Abstract

The present invention provides a method for producing isoprene, the method comprising continuously or intermittently supplying isobutene and / or tert-butanol, formaldehyde and water into an acidic aqueous solution, allowing the reactants to react, and at the same time, containing the produced isoprene A mixture of pentadiene, water, unreacted raw materials, and other low-boiling components is distilled from the reaction mixture to the outside of the reaction system, wherein the high-boiling-point The concentration of by-products is controlled within the range of 0.5-40% by mass.

Description

technical field [0001] The present invention relates to a method for producing isoprene. The isoprene obtained by the production method of the present invention is effectively used as a basic chemical raw material for various chemical products and a material for polymers. Background technique [0002] As for the production method of isoprene, there is known a method which comprises continuously or intermittently using isobutene and / or tert-butanol (hereinafter, "isobutene and / or tert-butanol" may be abbreviated as " C 4 "), formaldehyde, and water are supplied to a reactor containing an acidic aqueous solution, and the reaction is carried out while the produced isoprene is distilled out of the reaction system together with water and other low-boiling components (for example, JP-A- 59-70623). [0003] In addition, there is known a production method in which, in the production method described in JP-A-59-70623, C is 4 , a portion of the mixture of formaldehyde, water and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/24C07C1/20C07C2/86C07C2/88C07C11/18
CPCC07C2/867Y02P20/582C07C11/18
Inventor 山田修草野学高柳伸雄有元秀树
Owner KURARAY CO LTD
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