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A kind of method for preparing propylene carbonate

A technology of propylene carbonate and propylene oxide, applied in the field of preparing propylene carbonate, can solve the problems of unavailability and difficult contact of active centers, and achieve the effects of simple and easy control, high selectivity, and improved single-pass life.

Active Publication Date: 2018-03-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, because the branched chains of the structure-directing agent extend in the channel of the molecular sieve, its active centers (such as N, P, etc.) are difficult to contact with external molecules, so it is generally considered that the structure-directing agent existing in the channel of the molecular sieve cannot be used.

Method used

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  • A kind of method for preparing propylene carbonate
  • A kind of method for preparing propylene carbonate

Examples

Experimental program
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Effect test

Embodiment approach

[0075] According to a preferred embodiment of the present invention, the propylene oxide is prepared as follows: in the presence of methanol, propylene is contacted with hydrogen peroxide and titanium-silicon molecular sieves to separate and obtain propylene oxide.

[0076] According to the method of the present invention, the hydrogen peroxide may be hydrogen peroxide commonly used in the art in various forms. From the viewpoint of further improving safety, the method according to the present invention preferably uses hydrogen peroxide in the form of an aqueous solution. According to the method of the present invention, when the hydrogen peroxide is provided in the form of an aqueous solution, the concentration of the aqueous hydrogen peroxide solution can be a conventional concentration in the field, for example: 20-80% by weight. The aqueous solution of hydrogen peroxide whose concentration meets the above requirements can be prepared by conventional methods, and can also b...

Embodiment 1

[0104] (1) Preparation of titanium silicate molecular sieve TS-1 containing template

[0105] It is prepared according to the method described in Zeolites, 1992, Vol.12 pages 943-950 (the step of roasting is omitted), and the specific method is as follows.

[0106] At room temperature (20°C), mix 22.5 grams of tetraethyl orthosilicate with 7.0 grams of tetrapropylammonium hydroxide, add 59.8 grams of distilled water, stir and mix, then hydrolyze at normal pressure and 60°C for 1.0 hour to obtain ortho To the hydrolysis solution of tetraethyl silicate, slowly add a solution consisting of 1.1 g of tetrabutyl titanate and 5.0 g of anhydrous isopropanol under vigorous stirring, and stir the resulting mixture at 75°C for 3 hours to obtain a clear Transparent colloid, put this colloid into a stainless steel sealed reaction kettle, and place it at a constant temperature at 170°C for 3 days to obtain a mixture of crystallized products; filter the mixture, wash with water, and dry at 1...

Embodiment 2

[0123] Adopt the same method as Example 1 to prepare propylene carbonate, the difference is that in step (1), with reference to the method disclosed in the Chinese patent CN1132699C, the following method is used to prepare the hollow titanium-silicon molecular sieve HTS containing the template;

[0124] Take the template-containing molecular sieve obtained in Example 1 and roast the TS-1 molecular sieve at 550° C. for 3 hours according to the ratio of molecular sieve (gram): sulfuric acid (mol): water (mol) = 100:0.15:150, and mix evenly at 90° C. The reaction was carried out for 5.0 hours, and then filtered, washed and dried according to conventional methods to obtain acid-treated TS-1 molecular sieves. The above-mentioned acid-treated TS-1 molecular sieve is mixed uniformly according to the ratio of molecular sieve (gram): triethanolamine (mol): tetrapropyl ammonium hydroxide (mol): water (mol) = 100:0.20:0.15:180, put into The stainless steel sealed reaction kettle was plac...

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Abstract

The invention provides a method for preparing propylene carbonate, the method comprising: contacting a liquid raw material with a catalyst bed under cycloaddition reaction conditions, the liquid raw material containing propylene oxide, carbon dioxide and an optional solvent; The catalyst bed includes a first catalyst bed and a second catalyst bed, based on the flow direction of the liquid raw material, the first catalyst bed is located upstream of the second catalyst bed, and the second catalyst bed is located upstream of the second catalyst bed. The catalyst packed in the first catalyst bed is the catalyst containing titanium-silicon molecular sieve containing template agent, and the catalyst packed in the second catalyst bed is the catalyst containing titanium-silicon molecular sieve. By adopting the method of the invention to prepare propylene carbonate, higher target product selectivity and reactant conversion rate can be obtained, and the single pass life of the catalyst in the preparation process can be effectively improved.

Description

technical field [0001] The invention relates to a method for preparing propylene carbonate. Background technique [0002] Propylene carbonate is not only a high-boiling point, high-polarity aprotic organic solvent with excellent performance, but also an important organic synthesis intermediate. Propylene carbonate has been widely used as electrolyte for capacitors and high-energy batteries, desulfurization and decarburization solvents, metal extractants, adhesives and plasticizers for polymers; in addition, propylene carbonate can also be used for the synthesis of dimethyl carbonate and other important fine chemical products. [0003] At present, the industrial production methods of propylene carbonate include: phosgene method, transesterification method, chloropropanol method and cycloaddition method of propylene oxide and carbon dioxide. Among them, the cycloaddition method of propylene oxide and carbon dioxide has gradually become the main production method of propylene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D317/36
Inventor 林民史春风朱斌
Owner CHINA PETROLEUM & CHEM CORP
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