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Catalyst for preparing isophorone by condensation of acetone and preparation method thereof

The technology of isophorone and catalyst is applied in the field of catalyst and preparation of isophorone by acetone condensation, which can solve the problems of poor selectivity, environmental impact and the like, and achieve the effect of improving yield and good acid-base coordination.

Active Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the selectivity is poor, and the waste liquid contains alkaline hydroxide, which has an impact on the environment

Method used

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  • Catalyst for preparing isophorone by condensation of acetone and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Dissolve 192 grams of magnesium nitrate hexahydrate, 24 grams of calcium nitrate tetrahydrate, and 375 grams of aluminum nitrate nonahydrate in 1000 mL of deionized water to prepare a salt solution of magnesium, calcium and aluminum. Under mechanical stirring, add the mixed salt solution and ammonia water dropwise into distilled water at 80°C at the same time, and adjust the dropping rate so that the pH of the solution is around 9.5. After the dropwise addition was completed, the mixture was kept stirring for 20 hours, and left to cool for 6 hours. The cooled precipitate was filtered and washed with distilled water to a pH of about 7.0. The washed precipitate was dried at 110°C for 15 hours and then calcined at 500°C for 10 hours. The catalyst precursor A-1 was obtained.

[0025] Dissolve 7.1 g of praseodymium sulfate in 60 mL of distilled water to make an aqueous solution, and then spray it on A-1 at a spray speed of 3 mL / min. It was dried at 110°C for 8 hours and c...

Embodiment 2

[0027] Dissolve 192 grams of magnesium nitrate hexahydrate, 24 grams of calcium nitrate tetrahydrate, and 375 grams of aluminum nitrate nonahydrate in 1000 mL of deionized water to prepare a salt solution of magnesium, calcium and aluminum. Under mechanical stirring, add the mixed salt solution and ammonia water dropwise into distilled water at 80°C at the same time, and adjust the dropping rate so that the pH of the solution is around 9.5. After the dropwise addition was completed, the mixture was kept stirring for 20 hours, and left to cool for 6 hours. The cooled precipitate was filtered and washed with distilled water to a pH of about 7.0. The washed precipitate was dried at 110°C for 15 hours and then calcined at 500°C for 10 hours. The catalyst precursor A-2 was obtained.

[0028] Dissolve 14.2 grams of praseodymium sulfate in 110 mL of distilled water to make an aqueous solution, and then spray it on A-2 at a spray speed of 4 mL / min. It was dried at 110°C for 8 hours...

Embodiment 3

[0030] Dissolve 256 grams of magnesium nitrate hexahydrate, 24 grams of calcium nitrate tetrahydrate, and 188 grams of aluminum nitrate nonahydrate in 1000 mL of deionized water to prepare a salt solution of magnesium, calcium and aluminum. Under mechanical stirring, add the mixed salt solution and ammonia water dropwise into distilled water at 80°C at the same time, and adjust the dropping rate so that the pH of the solution is around 9.5. After the dropwise addition was completed, the mixture was kept stirring for 20 hours, and left to cool for 6 hours. The cooled precipitate was filtered and washed with distilled water to a pH of about 7.0. The washed precipitate was dried at 110°C for 15 hours and then calcined at 500°C for 10 hours. The catalyst precursor A-3 was obtained.

[0031] Dissolve 7.1 g of praseodymium sulfate in 60 mL of distilled water to make an aqueous solution, and then spray it on A-3 at a spray speed of 3 mL / min. It was dried at 130°C for 8 hours and c...

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Abstract

The invention discloses a catalyst of preparing isophorone by condensation of acetone and a preparation method of the catalyst. The catalyst comprises a magnesium-calcium-aluminum composite oxide and praseodymium sulfate, wherein mol ratios of all components in the terms of metallic elements are as follows: the mol ratio of Mg to Al is (1-3):1, the mol ratio of Mg to Ca is (5-20):1, and the mol ratio of Mg to Pr is (10-40):1. The preparation method comprises the following steps: preparing the magnesium-calcium-aluminum composite oxide according to a coprecipitation method, performing spray-soaking treatment on the magnesium-calcium-aluminum composite oxide by using a praseodymium sulfate solution, and drying and roasting to prepare a finished catalyst. According to the catalyst, when the selectivity of a target product isophorone is improved, the yield of the product isophorone is increased.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a catalyst for preparing isophorone by condensation of acetone and a preparation method thereof. Background technique [0002] Isophorone is an important organic chemical raw material. Its derivative isophorone diisocyanate is widely used in the production of polyurethane coatings. The 3,3,5-trimethylcyclohexanol produced after hydrogenation of isophorone It is an intermediate for the preparation of pharmaceutical cyclomandelate and hormones. Trimethyladipic acid prepared from isophorone is an important intermediate for the synthesis of new plasticizers, lubricants, dinitriles, diamines and diols. [0003] Isophorone has a high boiling point, low hygroscopicity, and small evaporation rate, and has become an important ketone solvent. Isophorone has strong dissolving ability, good dispersibility and excellent leveling property, so it is a good solvent for pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/053C07C49/603C07C45/74
Inventor 王春梅苏杰侯学伟李风华季秀珍
Owner CHINA PETROLEUM & CHEM CORP
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