CN104945230A - Method for producing polyformaldehyde dimethyl ether - Google Patents
Method for producing polyformaldehyde dimethyl ether Download PDFInfo
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- CN104945230A CN104945230A CN201410120807.9A CN201410120807A CN104945230A CN 104945230 A CN104945230 A CN 104945230A CN 201410120807 A CN201410120807 A CN 201410120807A CN 104945230 A CN104945230 A CN 104945230A
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- dimethyl ether
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- polyoxymethylene dimethyl
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Abstract
The invention relates to a method for producing polyformaldehyde dimethyl ether, belonging to the technical field of chemical synthesis. The method sequentially comprises the following steps: respectively introducing certain parts by mass of methanol and trioxymethylene into a reactor; adding an acidic catalyst into the reactor; controlling the reaction at certain reaction temperature under certain reaction pressure; and distilling the reaction mixture to obtain the polyformaldehyde dimethyl ether. The adopted catalyst is a liquid catalyst, and a small amount of the catalyst can be adopted to achieve the required effect. The catalyst has the advantages of high catalytic activity and high conversion rate. The liquid catalyst has the characteristics of low corrosivity, mild reaction conditions, high utilization ratio of raw materials, and favorable distribution of the reaction product, and thus, the content of the obtained polyformaldehyde dimethyl ether can reach 65% and much exceed that of the products produced by the enterprises at home and abroad.
Description
Technical field
The invention belongs to chemosynthesis technical field, be specifically related to a kind of method of producing polyoxymethylene dimethyl ether.
Background technology
In recent years, along with international community increases day by day to diesel oil demand, and limited diesel oil resource reduces day by day, has occurred that diesel oil is under-supply, the trend of price increase.Because alkane molecule amount is comparatively large in diesel oil, burn insufficient, increase the pollution to environment, therefore, in order to reach the object of environmental protection, domestic and international enterprise increases the research to diesel-dope.
At present, (skeleton symbol is CH to polyoxymethylene dimethyl ether
3o (CH
2o)
ncH
3) day by day obvious as the importance of diesel-dope.Be subject to the impact of the factors such as vapour pressure, boiling point and the solubleness in oil product, be suitable for the polyoxymethylene dimethyl ether that oil dope is generally 3≤n≤8.It has very high cetane value (on average up to 76) and oxygen level; ultra-low-sulphur diesel is better than with diesel oil blending quality; 10%-20% is added in diesel oil; the combustioncharacteristics of diesel oil can be significantly improved; effective raising thermo-efficiency, greatly reduces the discharge of the obnoxious flavour such as oxynitride and carbon monoxide, reduces the tail gas pollution of more than 50%; protect the environment that the mankind depend on for existence, increase the oilness of diesel oil significantly.But, in the technical process of the polyoxymethylene dimethyl ether of present most of manufacturer production, the shortcomings such as catalyzer has corrodibility, activity is lower, production cost is high, product yield is low, the severe reaction conditions of use.
Summary of the invention
For overcoming the defect existing for prior art, the invention provides a kind of method of producing polyoxymethylene dimethyl ether, can improve the utilization ratio of raw material and the transformation efficiency of catalyzer, production technique is simple simultaneously.
The present invention will solve the technical scheme that its technical problem adopts: design a kind of method of producing polyoxymethylene dimethyl ether, carry out successively as follows:
1) respectively the methyl alcohol of certain mass number and trioxymethylene are passed in reactor;
2) an acidic catalyst is added in reactor;
3) by reaction controlling under certain temperature of reaction, certain reaction pressure;
4) reaction mixture is distilled, can polyoxymethylene dimethyl ether be obtained.
Preferably, the methyl alcohol described in step 1) and the mass fraction of trioxymethylene are respectively 30-50 part, 40-60 part.
Preferably, step 2) in the mass fraction of an acidic catalyst be 5-7 part.
Preferably, step 2) described in an acidic catalyst be liquid catalyst, described liquid catalyst is one or more in p-methyl benzenesulfonic acid ammonium or trifluoromethane sulfonic acid pyridine or methylsulphonic acid imidazoles.
Preferably, the certain temperature of reaction described in step 3) is 80-120 DEG C, and certain reaction pressure is 1.0-3.0MPa.
The beneficial effect that the present invention has is:
1, catalyst type of the present invention is liquid catalyst, the effect that this catalyzer can use little amount to reach required, and catalytic activity is high, and transformation efficiency is high.The corrodibility of liquid catalyst is little, and reaction conditions is gentle, and the utilization ratio of raw material is high, and well, therefore, the content of the polyoxymethylene dimethyl ether of acquisition can reach 65%, far beyond the product content that domestic and international enterprise produces in the distribution of reaction after product.
2, each low raw-material cost used in the present invention, can be cost-saving in process of production, increases economic efficiency.
3, the technological process of production is simple, and working method is easy, and can realize automatic continuous production, mechanization degree is high, suitable penetration and promotion and suitability for industrialized production.
Embodiment
Embodiment one
Produce a method for polyoxymethylene dimethyl ether, carry out successively as follows:
1) methyl alcohol and the trioxymethylene that mass fraction are respectively 30 parts, 40 parts pass in reactor;
2) the p-methyl benzenesulfonic acid ammonium that mass fraction is 5 parts is added in reactor;
3) by reaction controlling 80 DEG C, under 1.0MPa;
4) reaction mixture is distilled, the polyoxymethylene dimethyl ether that content is 55.6% can be obtained.
Embodiment two
Produce a method for polyoxymethylene dimethyl ether, carry out successively as follows:
1) methyl alcohol and the trioxymethylene that mass fraction are respectively 40 parts, 50 parts pass in reactor;
2) the trifluoromethane sulfonic acid pyridine that mass fraction is 6 parts is added in reactor;
3) by reaction controlling 100 DEG C, under 2.0MPa;
4) reaction mixture is distilled, the polyoxymethylene dimethyl ether that content is 55.6% can be obtained.
Embodiment three
Produce a method for polyoxymethylene dimethyl ether, carry out successively as follows:
1) methyl alcohol and the trioxymethylene that mass fraction are respectively 50 parts, 60 parts pass in reactor;
2) the methylsulphonic acid imidazoles that mass fraction is 7 parts is added in reactor;
3) by reaction controlling 120 DEG C, under 3.0MPa;
4) reaction mixture is distilled, the polyoxymethylene dimethyl ether that content is 55.6% can be obtained.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-mentioned
Embodiment, to invention has been detailed description, will be understood by those skilled in the art that: still can carry out the present invention
Amendment or equivalent replacement, and do not depart from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in this
In the middle of the right of invention.
Claims (5)
1. produce a method for polyoxymethylene dimethyl ether, it is characterized in that: carry out successively as follows:
1) respectively the methyl alcohol of certain mass number and trioxymethylene are passed in reactor;
2) an acidic catalyst is added in reactor;
3) by reaction controlling under certain temperature of reaction, certain reaction pressure;
4) reaction mixture is distilled, can polyoxymethylene dimethyl ether be obtained.
2. a kind of method of producing polyoxymethylene dimethyl ether according to claim 1, is characterized in that: the mass fraction of the methyl alcohol described in step 1) and trioxymethylene is respectively 30-50 part, 40-60 part.
3. a kind of method of producing polyoxymethylene dimethyl ether according to claim 1 and 2, is characterized in that: step 2) in the mass fraction of an acidic catalyst be 5-7 part.
4. a kind of method of producing polyoxymethylene dimethyl ether according to claim 3, it is characterized in that: step 2) described in an acidic catalyst be liquid catalyst, described liquid catalyst is one or more in p-methyl benzenesulfonic acid ammonium or trifluoromethane sulfonic acid pyridine or methylsulphonic acid imidazoles.
5. a kind of method of producing polyoxymethylene dimethyl ether according to claim 4, it is characterized in that: the certain temperature of reaction described in step 3) is 80-120 DEG C, certain reaction pressure is 1.0-3.0MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410120807.9A CN104945230A (en) | 2014-03-28 | 2014-03-28 | Method for producing polyformaldehyde dimethyl ether |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410120807.9A CN104945230A (en) | 2014-03-28 | 2014-03-28 | Method for producing polyformaldehyde dimethyl ether |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104945230A true CN104945230A (en) | 2015-09-30 |
Family
ID=54160367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410120807.9A Pending CN104945230A (en) | 2014-03-28 | 2014-03-28 | Method for producing polyformaldehyde dimethyl ether |
Country Status (1)
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| CN (1) | CN104945230A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115850034A (en) * | 2022-12-05 | 2023-03-28 | 中国人民解放军军事科学院系统工程研究院 | Preparation method of low-polymerization-degree polymethoxy dialkyl ether |
-
2014
- 2014-03-28 CN CN201410120807.9A patent/CN104945230A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115850034A (en) * | 2022-12-05 | 2023-03-28 | 中国人民解放军军事科学院系统工程研究院 | Preparation method of low-polymerization-degree polymethoxy dialkyl ether |
| CN115850034B (en) * | 2022-12-05 | 2023-11-24 | 中国人民解放军军事科学院系统工程研究院 | Preparation method of low-polymerization-degree polymethoxy dialkyl ether |
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| PB01 | Publication | ||
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Application publication date: 20150930 |