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Применить Всего найдено 5. Отображено 5.
29-08-2023 дата публикации

Method for producing isosorbide

Номер: CN116655649A
Автор: HE LIMING, DU CHAO, XIE LUNJIA, WANG RUIPU
Принадлежит:

The invention relates to the field of isosorbide production, and discloses a method for producing isosorbide, which comprises the following steps: in the presence of a first catalyst and a protective agent, carrying out first dehydration treatment on sorbitol to obtain a first dehydration product; in the presence of a second catalyst, carrying out second dehydration treatment on the first dehydration product to obtain isosorbide, wherein the first catalyst is sulfonic ion exchange resin, and the second catalyst is different from the first catalyst. According to the present invention, the isosorbide is produced through the two-step method, such that the selectivity of the intermediate key product 1, 4-sorbitan (or 3, 6-sorbitan) is improved, and the yield of the final product isosorbide is improved.

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Номер записи: 1
08-08-2023 дата публикации

High-temperature-resistant strong-acid ion exchange resin as well as preparation method and application thereof

Номер: CN116554382A
Автор: HE LIMING, YI ZHUO, DU CHAO, XIE LUNJIA, WANG RUIPU, ZENG JIA, LIU QING
Принадлежит:

The invention relates to ion exchange resin, and discloses high-temperature-resistant strong-acid ion exchange resin as well as a preparation method and application thereof. The ion exchange resin copolymer contains a sulfonated styrene structural unit containing an electron withdrawing group as shown in a formula 1 and a sulfonated divinylbenzene structural unit as shown in a formula 2, and in the formula 1, X is the electron withdrawing group; when the high-temperature-resistant strong-acid ion exchange resin is applied to synthesis of isosorbide, the obtained isosorbide has relatively high purity and yield, and moreover, the acid content of the high-temperature-resistant strong-acid ion exchange resin is kept stable when the high-temperature-resistant strong-acid ion exchange resin is repeatedly used, and the obtained isosorbide still has relatively high purity and yield, so that the high-temperature-resistant strong-acid ion exchange resin can be used for synthesizing isosorbide. The ...

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Номер записи: 2
02-05-2023 дата публикации

Preparation method of diphenyl carbonate compound

Номер: CN116041182A
Автор: FENG ZAIXING, XIE LUNJIA, DU CHAO, LIU QING, ZENG JIA, SUN ZHUFANG, ZHAO SIYUAN, WANG RUIPU, HE LIMING
Принадлежит:

The invention relates to the field of organic synthesis, in particular to a preparation method of a diphenyl carbonate compound, which comprises the following steps: in the presence of a catalyst, carrying out disproportionation reaction on a compound as shown in a formula (II) to generate the diphenyl carbonate compound as shown in a formula (I), the catalyst comprises a compound with a structural formula as shown in a formula (1); r1 and R2 are respectively and independently selected from aliphatic hydrocarbon groups with 1 to 14 carbon atoms, cycloalkyl groups with 3 to 14 carbon atoms, substituted or unsubstituted aryl groups with 6 to 14 carbon atoms, or substituted or unsubstituted condensed ring aryl groups with 10 to 14 carbon atoms; x is halogen; r is hydrogen or alkyl of C1-C4. When the catalyst is used for catalyzing MPC disproportionation to produce DPC, the yield of DPC can be increased, the generation amount of anisole is reduced, and the separation cost of DPC is reduced.

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Номер записи: 3
22-08-2023 дата публикации

Catalyst, preparation method and application thereof, and reaction rectification preparation method of isosorbide

Номер: CN116621850A
Автор: HE LIMING, DU CHAO, XIE LUNJIA, WANG RUIPU, ZENG JIA, LIU QING
Принадлежит:

The invention relates to the field of preparation of isosorbide, and discloses a catalyst, a preparation method and application thereof, and a reactive distillation preparation method of isosorbide. The catalyst contains VIII B group metal oxide and at least one acidified IB, IVB, VB and VIB group metal oxide. The catalyst provided by the invention has high catalytic activity, long service life and stable catalytic performance, and is suitable for continuous production. Moreover, the isosorbide prepared by using the reaction rectification preparation method of the isosorbide by using the catalyst disclosed by the invention is high in purity, the process is stable, and continuous reaction rectification can be realized.

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Номер записи: 4
08-08-2023 дата публикации

Solvent-free preparation method of isosorbide as well as product and application thereof

Номер: CN116554188A
Автор: HE LIMING, DU CHAO, XIE LUNJIA, WANG RUIPU, ZENG JIA, LIU QING
Принадлежит:

The invention relates to a preparation method of isosorbide, and further relates to a solvent-free preparation method of isosorbide as well as a product and application thereof. The preparation method comprises the following steps: hexose is in contact with a solid catalyst for a catalytic dehydration reaction; wherein no solvent is added in the catalytic dehydration reaction. According to the preparation method, no solvent is added in the synthesis reaction and subsequent separation and purification processes of the isosorbide, so that the preparation method is more environment-friendly, and moreover, the preparation method still has relatively high yield and purity of the isosorbide.

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Номер записи: 5