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Method for preparing tert-butyl ether

A technology of tert-butyl ether and No. 1, applied in the field of organic chemical industry, can solve the problems of poor selectivity of mono-tert-butyl ether, harsh equipment material requirements, high pressure requirements, etc., and achieves improved conversion rate, high conversion rate, and high selection. sexual effect

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] To sum up, the existing technology has the following deficiencies: (1) The preparation and separation process is complicated and the pollution is serious; (3) The kettle reaction requires high pressure, and the corresponding requirements for the material of the equipment are strict; (3) Ethylene glycol The primary utilization rate is low; (4) the selectivity of ethylene glycol mono-tert-butyl ether is poor

Method used

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Examples

Experimental program
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Effect test

Embodiment 1~8

[0032] The metered 99% chemically pure ethylene glycol and mixed C4 (mass content of isobutylene 27.16%) were respectively injected into the first fixed bed pre-reactor equipped with resin catalyst and controlled at 60~65°C by plunger pump, and then Use a metering pump to inject the reaction product and additional mixed carbon dioxide into the second fixed-bed reactor equipped with a resin catalyst and whose temperature is controlled at 45~50°C, and then inject the further reaction product and additional mixed carbon dioxide into the second fixed-bed reactor with a metering pump Injected with resin catalyst, temperature control

[0033] The third fixed-bed reactor was manufactured at 38-42°C. The length of the fixed-bed reactor was 1500m, the inner diameter of the reactor was 8mm, and the loading amount of the catalyst was 100ml on a dry basis. The test results are shown in Table 1 above.

[0034] Table 1 Reaction results of resin as catalyst

[0035]

[0036] Note: The f...

Embodiment 9~12

[0038] Compared with Examples 1-8, only the content of isobutene (57.95%) in the mixed C4 was changed, and the conditions of the fixed-bed reactor and other conditions were unchanged. The test results are shown in Table 2.

[0039] Table 2, the reaction result of changing the concentration of isobutene in mixed carbon four

[0040] .

Embodiment 18~20

[0046] The metered 99% chemically pure ethylene glycol and mixed C4 (mass content of isobutylene: 27%) are respectively injected into the first fixed bed equipped with molecular sieve catalyst, the temperature is controlled at 60~65°C, and the reaction pressure is 1.5MPa. Pre-reactor; then the reaction product and additional mixed carbon four are injected into the second fixed-bed reactor with a molecular sieve catalyst, temperature controlled at 45~50°C, and reaction pressure 1.5MPa (alcohol isobutene molar ratio 3 : 1); and then inject the further reaction product and additional mixed carbon four into the third fixed-bed reactor equipped with molecular sieve catalyst, temperature controlled at 38~42°C, and reaction pressure 1.5MPa with a metering pump. The length of the fixed-bed reactor is 1500m, the inner diameter of the reactor is 8mm, and the loading amount of the catalyst is 100ml on a dry basis. The test results are shown in Table 4.

[0047] Table 4, the reaction re...

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Abstract

The invention discloses a method for preparing tert-butyl ether, belongs to the field of organic chemical industry, and particularly relates to a method for preparing ethylene glycol tert-butyl ether in the presence of a catalyst. The method is characterized by comprising the following specific steps: mixing isobutylene containing 30-90% by mass of inert gas with ethylene glycol, introducing a mixture into a continuous distributed control reaction assembly for reaction, performing flash evaporation on a light component after the continuous reaction, and performing refinement and separation on a reaction product, wherein the continuous distributed control reaction assembly consists of three fixed bed reactors continuously connected in series, the fixed bed reactors are a reactor I (4), a reactor II (7) and a reactor III (11) respectively, different reaction conditions are required in the fixed bed reactors, and same or different solid catalysts are arranged in the fixed bed reactors. According to the method, ethylene glycol tert-butyl ether generated by mixing ethylene glycol with isobutylene according to a relatively low molar ratio is relatively high in selectivity which reaches more than 90%, and isobutylene is relatively high in conversion rate.

Description

technical field [0001] The invention discloses a method for producing tert-butyl ether, which belongs to the field of organic chemical industry, and specifically relates to a method for preparing ethylene glycol tert-butyl ether in the presence of a catalyst as raw materials of ethylene glycol and refinery C4. Background technique [0002] Ethylene glycol tert-butyl ether has many advantages such as high flash point, non-flammability, and low toxicity. It is an important industrial solvent and an intermediate in chemical synthesis. Because it contains ether bonds and hydroxyl groups in its molecule, it has excellent properties. It is widely used in water-based surface coatings, jet fuel anti-icing agents, brake fluids, inks, dyes, medicines, spices and cleaning agents, and can also be used as the base fluid for synthetic brake fluids in the automotive industry. [0003] The preparation method of glycol ethers usually has the following methods: [0004] ①Reaction method of s...

Claims

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Application Information

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IPC IPC(8): C07C43/13C07C41/06
CPCC07C41/06
Inventor 朱相春孙强杨忠梅何宗华刘淑芝李刚侯磊李玉田
Owner CHINA PETROLEUM & CHEM CORP
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