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Catalyst for synthesizing dihydric alcohol mono-tert-butyl ether, and preparation method and application thereof

A mono-tert-butyl ether and catalyst technology, applied in the field of chemical synthesis, can solve problems such as difficult mixing, low solubility in isobutylene, and slow reaction rate

Pending Publication Date: 2021-10-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high viscosity of diols at low temperatures and the low solubility of isobutylene in them, it is difficult to mix the two, resulting in slow reaction rates and more isobutylene oligomers or di-tert-butyl diols. By-products such as base ethers, the selectivity of the target product glycol mono-tert-butyl ether is low

Method used

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  • Catalyst for synthesizing dihydric alcohol mono-tert-butyl ether, and preparation method and application thereof
  • Catalyst for synthesizing dihydric alcohol mono-tert-butyl ether, and preparation method and application thereof
  • Catalyst for synthesizing dihydric alcohol mono-tert-butyl ether, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Step 1: Mix 70g of β molecular sieve powder, 5g of turnip powder, and 75ml of silica sol, add water, knead and extrude, dry at 120°C, and roast at 500°C for 4 hours to obtain catalyst precursor I.

[0055] Step 2: Prepare 1 L of citric acid aqueous solution II with a concentration of 0.2 mol / L, immerse the catalyst precursor I in the aqueous solution II, soak at 90°C for 8 hours, wash with deionized water, dry at 120°C, and bake at 500°C.

[0056] Step 3: Dissolve 3.3g of tin tetrachloride pentahydrate and 2.4g of phosphoric acid in deionized water to obtain solution III, impregnate it on the catalyst prepared in step 2, then dry it at 100°C and calcinate at 520°C for 4 hours to obtain catalyst A1.

[0057] The catalyst composition, total acid content and strong acid ratio are shown in Table 1a.

Embodiment 2

[0059] Step 1: Mix 70g of β molecular sieve powder, 5g of turnip powder, and 75ml of silica sol, add water, knead and extrude, dry at 120°C, and roast at 500°C for 4 hours to obtain catalyst precursor I.

[0060] Step 2: prepare 1 L of citric acid aqueous solution II with a concentration of 0.2 mol / L, immerse the catalyst precursor I in the aqueous solution II, soak at 90°C for 8 hours, wash with deionized water, dry at 120°C, and bake at 500°C for 4 hours.

[0061] Step 3: Dissolve 3.3g of tin tetrachloride pentahydrate in deionized water to obtain solution III, impregnate the catalyst prepared in step 2, then dry at 100°C, and roast at 520°C for 4 hours to obtain catalyst A2.

[0062] The catalyst composition, total acid content and strong acid ratio are shown in Table 1a.

Embodiment 3

[0064] Step 1: Mix 70g of β molecular sieve powder, 5g of turnip powder, and 75ml of silica sol, add water, knead and extrude, dry at 120°C, and roast at 500°C for 4 hours to obtain catalyst precursor I.

[0065] Step 2: Prepare 1 L of citric acid aqueous solution II with a concentration of 0.2 mol / L, immerse the above catalyst precursor I in the aqueous solution II, immerse at 90°C for 8 hours, wash with deionized water, dry at 120°C, and roast at 500°C for 4 hours, That is, catalyst A3 was obtained.

[0066] The catalyst composition, total acid content and strong acid ratio are shown in Table 1a.

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Abstract

The invention discloses a catalyst for synthesizing dihydric alcohol mono-tert-butyl ether, and a preparation method and application thereof. The catalyst comprises a beta molecular sieve and a binder; 100 parts by weight of the beta molecular sieve and the binder comprise 40-90 parts by weight of the beta molecular sieve and 10-60 parts by weight of the binder; the binder is silicon oxide; and based on the total weight of the catalyst, the acid content of the catalyst is 130-700 [mu]mol / g. The beta molecular sieve is selected as an active component of the etherification catalyst, and the acid amount of the catalyst and the ratio of strong acid are controlled, so that the reverse reaction in a high-temperature region and the reaction rate of dihydric alcohol di-tert-butyl ether can be effectively inhibited, and the conversion per pass of isobutene and the yield of dihydric alcohol mono-tert-butyl ether are improved.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a catalyst for synthesizing diol mono-tert-butyl ether, a preparation method and an application. Background technique [0002] Glycol mono-tert-butyl ether is a substance with both a hydroxyl group and an ether structure. These two groups are respectively hydrophilic and lipophilic, so it can dissolve hydrophobic and water-soluble compounds at the same time, so it is General purpose solvent with excellent properties. It is mainly used as an industrial solvent, and has a wide range of applications in coatings, cleaning, printing, leather, etc. [0003] At present, the ethylene oxide route is the only production method for the industrial production of primary alcohol glycol ethers. However, when tertiary alcohols are used, since tertiary alcohols are difficult to react with ethylene oxide, the selectivity of monoethylene glycol ether is particularly low, and higher mol...

Claims

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Application Information

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IPC IPC(8): B01J29/70B01J29/76C07C41/06C07C43/13
CPCB01J29/7057B01J29/7615C07C41/06B01J2229/186C07C43/13
Inventor 龚海燕刘俊涛张旭
Owner CHINA PETROLEUM & CHEM CORP
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