CN1095395C - Catalyst for synthesizing dimethyl carbonate and its preparing process - Google Patents
Catalyst for synthesizing dimethyl carbonate and its preparing process Download PDFInfo
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- CN1095395C CN1095395C CN00117793A CN00117793A CN1095395C CN 1095395 C CN1095395 C CN 1095395C CN 00117793 A CN00117793 A CN 00117793A CN 00117793 A CN00117793 A CN 00117793A CN 1095395 C CN1095395 C CN 1095395C
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- carbonate
- catalyst
- dimethyl carbonate
- catalyzer
- earth metal
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Abstract
The present invention relates to a catalyst for synthesizing dimethyl carbonate and a preparation method thereof. In an atmosphere of nitrogen gas, temperature is increased to 600 to 1000 DEG C in a temperature increasing rate of 5 to 12 DEG C/min and alkali earth metal carbonate is calcined for 2 to 6 hours to obtain products. The catalyst of the present invention has the characteristics of high activity and selectivity, low consumption, no corrosion to reactors, etc. After reactions end, the catalyst can be separated through filtration and can be repeatedly used.
Description
The invention belongs to from the Catalysts and its preparation method of methyl alcohol and propylene carbonate Synthesis of dimethyl carbonate.
As a kind of eco-friendly organic synthesis intermediate and gasoline dope, methylcarbonate (Dimethyl Carbonate letter DMC) synthetic be subjected in recent years paying attention to widely with using (Y.Ono., Appl.Catal.A:, 1997,155,133).Synthesizing DMC from propylene carbonate and methyl alcohol through transesterify, because process is simple, and can generate dibasic alcohol, thereby is competitive method (A.G.Shaikh, S.Sivaram, Chem.Rev., 1996,96,951).
Propylene carbonate (being called for short PC) is as follows with the methyl alcohol reaction formula:
In this reaction, much more general with (Jiang Qi etc., gas chemical industry, 1997,22 (5), 1) such as alkali metal hydroxide, alkaline carbonate, alkali metal alcoholates as catalyzer.But, cause difficulty for the separation and the repeated use of catalyzer because of it is a homogeneous reaction.
Goal of the invention of the present invention provides a kind of catalyzer from methyl alcohol and propylene carbonate Synthesis of dimethyl carbonate, and this catalyzer has high reactivity and is easy to be separated from product.
Goal of the invention of the present invention is achieved in that and adopts alkaline earth metal carbonate roasting and getting under nitrogen atmosphere.
The mol ratio of catalyzer of the present invention:
Alkaline earth metal oxide: alkaline earth metal carbonate=1: 0.5-10.
Aforesaid alkaline earth metal carbonate is magnesiumcarbonate, lime carbonate, Strontium carbonate powder or barium carbonate.
As mentioned above the Preparation of catalysts method be with alkaline earth metal carbonate under nitrogen protection with 3-10 ml/min flow velocity, with 5-12 ℃/minute temperature rise rate, be warming up to 600-1000 ℃ and carried out roasting 2-6 hour.
Aforesaid catalyzer and other catalyzer relatively have higher activity and selectivity, and consumption is few, and reactor is not had corrosion, belongs to environment-friendly catalyst.After reaction finished, catalyzer can obtain separating by filtration, and it is reusable.
Embodiments of the invention are as follows:
Embodiment 1
Lime carbonate roasting 4 hours under nitrogen atmosphere, 600 ℃ of maturing temperatures, its temperature rise rate are 10 ℃/min, and nitrogen flow rate 4ml/min obtains this catalysts, and it consists of CaO: CaCO
3=1: 5.Add methyl alcohol and propylene carbonate by certain mole proportioning in reaction vessel, the add-on of catalyzer is 4% of a reaction mixture weight, under agitation condition, is warming up to 120 ℃, 2 hours reaction times.Cooling is filtered, and catalyzer is separated with reaction solution, the reaction solution gas chromatographic analysis, and the productive rate of DMC is 35.8%, the transformation efficiency of PC is 41.1%.
Embodiment 2
Lime carbonate roasting 5 under nitrogen atmosphere is advanced for a short time, and 900 ℃ of maturing temperatures, its temperature rise rate are 7 ℃/min, and nitrogen flow rate 9ml/min obtains this catalysts, and it consists of CaO: CaCO
3=1: 3.5.All the other are with embodiment 1, the reaction solution gas chromatographic analysis, and the productive rate of DMC is 39.5%, the transformation efficiency of PC is 42.1%.
Embodiment 3
Magnesiumcarbonate roasting 6 hours under nitrogen atmosphere, 700 ℃ of maturing temperatures, its temperature rise rate are 5 ℃/min, and nitrogen flow rate 5ml/min obtains this catalysts, and it consists of MgO: MgCO
3=1: 0.5.All the other are with embodiment 1, the reaction solution gas chromatographic analysis, and the productive rate of DMC is 32.2%, the transformation efficiency of PC is 34.5%.
Embodiment 4
Barium carbonate roasting 3 hours under nitrogen atmosphere, 800 ℃ of maturing temperatures, its temperature rise rate are 9 ℃/min, and nitrogen flow rate 8ml/min obtains this catalysts, and it consists of BaO: BaCO
3=1: 10.All the other are with embodiment 1.It is 40.9% that gas chromatographic analysis, the productive rate of DMC are used in reaction, and the transformation efficiency of PC is 44.1%.
Embodiment 5
Strontium carbonate powder roasting 4 under nitrogen atmosphere is advanced for a short time, and 900 ℃ of maturing temperatures, its temperature rise rate are 12 ℃/min, and nitrogen flow rate 7ml/min obtains this catalysts, and it consists of SrO: SrCO
3=1: 8.All the other are with embodiment 1, the reaction solution gas chromatographic analysis, and the productive rate of DMC is 37.1%, the transformation efficiency of PC is 45.3%.
Embodiment 6
Magnesiumcarbonate roasting 2 under nitrogen atmosphere is advanced for a short time, and 600 ℃ of maturing temperatures, its temperature rise rate are 10 ℃/min, and nitrogen flow rate 10ml/min obtains this catalysts, and its level becomes MgO: MgCO
3=1: 1.All the other are with embodiment 1, the reaction solution gas chromatographic analysis, and the productive rate of DMC is 28.5%, the transformation efficiency of PC is 31.1%.
Claims (2)
1. the catalyzer of a Synthesis of dimethyl carbonate is characterized in that the mol ratio of catalyzer is:
Alkaline earth metal oxide: alkaline earth metal carbonate=1: 0.5-10.
2. the catalyzer of a kind of Synthesis of dimethyl carbonate as claimed in claim 1 is characterized in that described alkaline earth metal carbonate is magnesiumcarbonate, lime carbonate, Strontium carbonate powder or barium carbonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00117793A CN1095395C (en) | 2000-06-21 | 2000-06-21 | Catalyst for synthesizing dimethyl carbonate and its preparing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00117793A CN1095395C (en) | 2000-06-21 | 2000-06-21 | Catalyst for synthesizing dimethyl carbonate and its preparing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1304790A CN1304790A (en) | 2001-07-25 |
| CN1095395C true CN1095395C (en) | 2002-12-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00117793A Expired - Fee Related CN1095395C (en) | 2000-06-21 | 2000-06-21 | Catalyst for synthesizing dimethyl carbonate and its preparing process |
Country Status (1)
| Country | Link |
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| CN (1) | CN1095395C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115463675A (en) * | 2022-10-26 | 2022-12-13 | 高化学（江苏）化工新材料有限责任公司 | Novel catalyst for synthesizing dimethyl carbonate and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS517410A (en) * | 1974-07-08 | 1976-01-21 | Hitachi Ltd | BOSUIGATA DENDOKI |
| CN1103862A (en) * | 1993-07-15 | 1995-06-21 | 拜尔公司 | Process for the preparation of dimethyl carbonate |
| CN1107834A (en) * | 1993-11-24 | 1995-09-06 | 拜尔公司 | Process for working up the liquid reaction products from the Cu-catalysted preparation of dimethyl carbonate |
-
2000
- 2000-06-21 CN CN00117793A patent/CN1095395C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS517410A (en) * | 1974-07-08 | 1976-01-21 | Hitachi Ltd | BOSUIGATA DENDOKI |
| CN1103862A (en) * | 1993-07-15 | 1995-06-21 | 拜尔公司 | Process for the preparation of dimethyl carbonate |
| CN1107834A (en) * | 1993-11-24 | 1995-09-06 | 拜尔公司 | Process for working up the liquid reaction products from the Cu-catalysted preparation of dimethyl carbonate |
Non-Patent Citations (1)
| Title |
|---|
| 化工辞典 1996.9.1 化学工业出版社，第三版，王箴主编 * |
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| CN1304790A (en) | 2001-07-25 |
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