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Production method for generating isooctene by utilizing acetic acid and mixed C4 and producing high-purity isooctane by hydrogenating

A manufacturing method and technology of isooctene, which is applied in the preparation of organic compounds, hydrogenation of hydrocarbons, preparation of carboxylic acid esters, etc., can solve the problem of inability to obtain high-purity isooctene and isobutane, difficult separation of production products, and environmental protection Prominent problems and other problems, to achieve the effect of improving the ability to resist risks, high octane number, and high purity

Inactive Publication Date: 2018-10-16
YUEYANG FUHE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Therefore, with the development of ethanol gasoline in my country, it is extremely important to invent a method to replace isobutene in mixed C4 with a substance that can replace MEBT. It is more reasonable and effective to generate iso-octene by iso-butene polymerization and then hydrogenate iso-octane measures, but the above process methods all have the following problems: dimerization selectivity is poor, production products are difficult to separate, high-purity isooctene and isobutane cannot be obtained, and environmental protection problems are prominent

Method used

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  • Production method for generating isooctene by utilizing acetic acid and mixed C4 and producing high-purity isooctane by hydrogenating
  • Production method for generating isooctene by utilizing acetic acid and mixed C4 and producing high-purity isooctane by hydrogenating

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Embodiment 1

[0042] At present, there is a relatively advanced synthetic production of tert-butyl acetate in China (Yueyang Fuhe Technology Co., Ltd.), which uses acetic acid and high-purity isobutene to be mixed in a certain proportion and the recycled material of the system is combined into pretreatment feed, which enters the pretreatment reaction through a flow meter. After removing metal ions, it enters the first-stage esterification reactor and the second-stage esterification reactor in series, and the reacted material enters the stripping tower, and the unreacted isobutene with a low boiling point is re- The steam from the boiler steams into the top of the tower, enters the stripper condenser to condense, and then enters compression to recover isobutene. The material at the bottom of the stripper is measured by a flow meter and then pumped to the deacidification tower. It mainly produces tert-butyl acetate products, in which the isooctene produced by by-products is separated, and the ...

Embodiment 2

[0046] In the process of implementation, we adopt the synthetic reaction of mixed C4 and glacial acetic acid to generate crude ester, which further reduces the production cost. The macroporous cationic resin catalyst is added into the reactor tube, and then a certain amount of glacial acetic acid is added into the reaction system to establish a cycle. Control the speed and add mixed C4 evenly. The molar ratio of acid to ene is 1:7. The reaction temperature is 28°C and the reaction pressure is 0.8MPa. After 2.5 hours of reaction, take a sample for analysis. The yield of tert-butyl acetate is about 40%. , selectivity 95.36%. An example by mass percentage is shown in Table 2 below.

[0047] Table 2

[0048]

Embodiment 3

[0050] Mix the material after C4 synthesis with the tert-butyl acetate from the post-distillation section, and the ester (content about 80-90%) is transferred to a reactor equipped with the same type of catalyst to establish a cycle, and the reaction temperature is 55°C , the reaction pressure is 0.8MPa, and after 2.5h of reaction, sampling is carried out for analysis. The yield of isooctene is about 40%, and the selectivity is 85.48%. The following table 3 is given as an example by mass percentage.

[0051] table 3

[0052] Time 2018

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Abstract

The invention discloses a production method for generating isooctene by utilizing acetic acid and mixed C4 and producing high-purity isooctane by hydrogenating. The production method is characterizedby comprising the following steps: step 1, carrying out esterification; enabling acetic acid and isobutene in the mixed C4 to be subjected to esterification reaction, so as to generate tert-butyl acetate; step, carrying out polymerization; decomposing tert-butyl acetate into isobutene and synchronously carrying out dimerization reaction to generate isooctene; then carrying out steam stripping separation; carrying out distillation separation on a liquid-phase material to obtain isooctene; carrying out third-step recycling reaction on a gas phase; step 3, carrying out recycling and esterification on isobutene; step 4, hydrogenating and desulfurizing isooctene to obtain the high-purity isooctane and hydrogen sulfide. The method disclosed by the invention is green and environmentally friendly,high dimerization selectivity and high product purity; an intermediate product and acetic acid can be circularly utilized and requirements on large-scale and continuous production can be met; an MTBE(Methyl Tert-butyl Ether) device can be replaced after ethanol gasoline of China is implemented.

Description

technical field [0001] The invention relates to a production method of extracting and esterifying with acetic acid, polymerizing and mixing isobutene in C4 to generate isooctene, and then performing hydrogenation to generate high-purity isobutane. Background technique [0002] Isooctane, also known as 2,2,4-trimethylpentane, molecular formula C8H18, is an isomer of octane. The English name is 2,2,4-trimethylpentane; isooctane, colorless, transparent liquid, relative density 0.69 (water is 1), flash point 4.5°C, boiling point 99.2°C, insoluble in water, flammable, irritating, volatile . [0003] Isooctane is a standard substance for testing the antiknock performance of gasoline. The octane ratings for isooctane and heptane are 100 and 0, respectively. If the antiknock performance of a gasoline sample is equivalent to a certain composition of isooctane-heptane mixture in a single-cylinder engine under specified test conditions, the octane number of the sample is equal to th...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/14C07C1/213C07C2/06C07C7/04C07C7/06C07C11/09C07C5/03C07C9/16C07C11/02
CPCC07C1/213C07C2/06C07C5/03C07C7/04C07C7/06C07C67/08C07C2531/08C07C69/14C07C11/09C07C11/02C07C9/16
Inventor 李国强罗四顺吴继明李丛绿
Owner YUEYANG FUHE TECH
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