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Method for preparing tert-amyl alcohol

A technology of tert-amyl alcohol and isopentene, which is applied in the field of preparation of tert-amyl alcohol, can solve the problems of long reaction time and high energy consumption, and achieve the effects of accelerated reaction rate, improved mass transfer rate and mild reaction

Inactive Publication Date: 2018-04-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that there are technical defects such as excessive energy consumption and too long reaction time in the process of preparing tert-amyl alcohol by hydration of isoamylene in the prior art.

Method used

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Embodiment 1

[0028] The crude isoamylene component (98% isoamylene content) produced by the isoamylene plant of Shanghai Petrochemical Co., Ltd., deionized water and co-catalyst tetrabutylammonium bromide were used at a water-to-ene molar ratio of 1:10, After being metered by a metering pump, they are mixed by a high-efficiency static mixer, and the preheater is preheated to 60°C, and then enters a fixed-bed reactor. The co-catalyst is used in an amount of 0.02% by weight of isopentene. After the material is distributed by the distributor, it passes through the bed layer mixed with inert magnetic balls and resin catalyst for hydration reaction. The reactor was filled with 20 mL of cation exchange resin (Dow Chemical Company, Amberlyst type 35). The conditions of the hydration reaction are reaction temperature 60°C, reaction pressure 1.2MPa, liquid hourly volume space velocity 0.25h -1 . The material comes out of the reactor and is cooled to room temperature through a condenser. System ...

Embodiment 2

[0031] Amberlyst 35 type cation exchange resin was adopted as the catalyst, and tetrabutylammonium bromide was used as the cocatalyst, and the loading amount of the catalyst was the same as in Example 1. The co-catalyst is used in an amount of 0.08% by weight of isopentene. The ratio of raw materials is that the molar ratio of water to ene is 1:5, the hydration reaction conditions are reaction temperature 50°C, reaction pressure 1.5MPa, liquid hourly volume space velocity 0.5h -1 . The single-pass conversion rate of the reaction is 40.8%, and the selectivity is 99.7%.

[0032] Carry out distillation according to the said method of embodiment 1, the purity that records tert-amyl alcohol by chromatographic analysis is 99.2%.

Embodiment 3

[0034] Adopt QRE-01 type cation exchange resin as catalyst, use tetrabutylammonium bromide as cocatalyst, and the loading amount of catalyst is the same as Example 1. The co-catalyst is used in an amount of 0.15% by weight of isopentene. Raw material ratio is water-ene molar ratio of 1:3, hydration reaction conditions are reaction temperature 80°C, reaction pressure 0.5MPa, liquid hourly volume space velocity 0.8h -1 . The single-pass conversion rate of the reaction is 59.6%, and the selectivity is 99.0%.

[0035] Carry out distillation according to the said method of embodiment 1, the purity that records tert-amyl alcohol by chromatographic analysis is 99.0%.

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Abstract

The invention discloses a method for preparing tert-amyl alcohol. The method disclosed by the invention comprises the following steps: enabling isopentene-enriched materials, water and promoter mixtures to simultaneously enter a static mixer, mixing, and introducing the mixed materials to enter a fixed bed reactor filled with a strong acid cation exchange resin to carry out hydration reaction; andsimply distilling and rectifying after the reaction is ended, thereby obtaining the high-purity product (tert-amyl alcohol) on a column reactor. According to the method disclosed by the invention, tetrabutylammonium bromide is added into a hydrate system to serve as the promoter, the contact environment between isopentene and an active center on the catalyst surface is improved, the liquid film lipophilicity on the catalyst surface is improved, contact resistance between isopentene and the catalyst surface is reduced, diffusion of isopentene to the active center of the catalyst surface is facilitated, and the reaction rate is further improved.

Description

technical field [0001] The invention relates to a method for preparing tert-amyl alcohol by hydrating isopentene, in particular to a method for preparing tert-amyl alcohol by adding co-catalyst in excess of isopentene. Background technique [0002] Tert-Amyl Alcohol is a basic organic chemical raw material used in the production of pinacolone, tert-amylbenzene and tert-amylanthraquinone (2-amylanthraquinone) for the synthesis of musk musk and color coupler for color film . In addition, tert-amyl alcohol can also be used as solvent, plasticizer and non-ferrous metal flotation agent. The traditional production of tert-amyl alcohol adopts the acetone-acetylene method. The raw material cost of this process is high, the process flow is complicated, and industrial waste residue will be produced when calcium carbide is hydrolyzed to produce acetylene, which will pollute the environment. With the continuous development of C5 separation technology, the output of isopentene is incr...

Claims

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Application Information

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IPC IPC(8): C07C29/04C07C29/80C07C31/125B01J31/10
CPCB01J31/10B01J2231/32C07C29/04C07C29/80C07C31/125Y02P20/584
Inventor 陈洪军祁正娟徐晓红胡国君李莹郑重
Owner CHINA PETROLEUM & CHEM CORP
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