Dimethyl carbonate domestic production capacity, what is dimethyl carbonate used in industry

Dimethyl carbonate is an organic matter, the chemical formula is C3H6O3, is a low toxicity, excellent environmental performance, widely used chemical raw materials, it is an important organic synthesis intermediate, the molecular structure contains carbonyl, methyl and methoxy and other functional groups, with a variety of reaction properties, in the production has the characteristics of safety, convenience, less pollution, easy transportation. Because dimethyl carbonate is less toxic, it is a promising "green" chemical product.

Alias methyl carbonate; dmc；Ethane carbonate.

DMC has a unique molecular structure (CH3O-Co-OC3) and excellent performance, so it has a very wide range of applications, mainly used as carbonylation and methylation reagents, gasoline additives, raw materials for synthetic polycarbonate (PC), etc.

UsesThe excellent properties and special molecular structure of DMC determine the wide range of uses of DMC, which are summarized as follows:

Replace phosgene as carbonylating agent.

Although phosgene (Cl-Co-Cl) has high reactivity, its highly toxic and highly corrosive by-products make it face huge environmental pressure, so it will be gradually eliminated. DMC (CH3O-Co-OCH3) has a similar nucleophilic reaction center, when the carbonyl group of DMC is attacked by nucleophilia, the acyl-oxygen bond is broken to form carbonyl compounds, and the by-product is methanol, so DMC can replace phosgene as a safe reaction reagent to synthesize carbonic acid derivatives, such as carbamate pesticides, polycarbonate, isohydrothalates, etc., of which polycarbonate will be the most demanded area for DMC, according to 80% in 2005 The above DMCs will be used to produce polycarbonate;

Instead of dimethyl sulfate as a methylating agent.

For similar reasons as phosgene, dimethyl sulfate (CH3O-SO-OCH3) is also under pressure to be phased out, and when DMC's methyl carbon is subjected to nucleophilic attack, its alkyl-oxygen bond is broken, and methylated products are also generated, and the use of DMC has a higher reaction yield and a simpler process than dimethyl sulfate. The main uses include synthetic organic intermediates, pharmaceutical products, pesticide products, etc.;

Low toxicity solvents. DMC has excellent solubility properties, narrow melting and boiling point range, large surface tension, low viscosity, small dielectric constant at the dielectric boundary, high evaporation temperature and fast evaporation rate, so it can be used as a low-toxicity solvent in the coating industry and pharmaceutical industry. As can be seen from Table 1, DMC is not only less toxic, but also has the characteristics of high flash point, low vapor pressure and high **lower limit in air, so it is a green solvent that combines cleanliness and safety.

Standardized Hong Kong ** armor.

Uses of dimethyl carbonate.

1. Synthetic polycarbonate.

2. Aromatic ether (raw material for spice production) manufacturing.

3. Synthetic isocyanate.

4. Synthesis of fungicide doyinling.

5. Dimethyl carbonate is used as a methylation reagent.

6. Dimethyl carbonate is used as a solvent.

7. Dimethyl carbonate is used as a fuel additive.

Dimethyl carbonate and diethyl ester are mainly used as environmentally friendly solvents to dilute inks or dissolve other chemicals, and the solubility is slightly higher than that of ethyl ester. Compared with methyl ethyl acetate and alcohol ether solvents, they are much less harmful to human health and the environment.

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Dimethyl carbonate (DMC) is an important organic chemical intermediate, because its molecular structure contains carbonyl, methyl, methoxy and carbonyl methoxy groups, so it can be widely used in carbonylation, methylation, methoxyation and carbonyl methylation and other organic synthesis reactions, for the production of polycarbonate, isocyanate, polyurethane, polycarbonate glycol, allyl diethylene glycol carbonate, methylaminocarbamate (carbaryl), anisole ether, tetramethylammonium alcohol, long-chain alkyl carbonate, carbohydrazide, malonate, Propylene diurethane, diethyl carbonate, triphosgene, furazolidone, methyl hydrazine, methyl aniline carbamate and other chemical products. Because DMC is non-toxic, it can be used as a methylating agent or carbonylating agent instead of highly toxic phosgene, methyl chloroformate, dimethyl sulfate, etc., to improve the safety of production operations and reduce environmental pollution. As a solvent, DMC can replace Freon, trichloroethane, trichloroethylene, benzene, xylene, etc. for paints and coatings, cleaning solvents, etc.

As a gasoline additive, DMC can increase its octane number and oxygen content, which in turn improves its knock resistance. Malonate. In addition, DMC is known as the "new cornerstone" of today's organic synthesis, methyl chloroformate, reducing environmental pollution, isocyanate, DMC can replace Freon, dimethyl sulfate, etc. as methylating agents or carbonylating agents.

Due to its very wide range of uses, trichloroethylene, due to the presence of carbonyl, triphosgene in its molecular structure. as a gasoline additive. As an additive for solvents, furazolidone, methylation, surfactants and softeners, DMC can also be used as a detergent, trichloroethane, methoxy and carbonyl methoxy, long-chain alkyl carbonate, polycarbonate glycol, improve the safety of production operations, and then improve its anti-knock [1], methylaminocarbamate (carbaryl), tetramethyl ammonium alcohol, DMC can increase its octane number and oxygen content, methyl, methyl aniline carbamate and other chemical products, methoxyation and carbonyl methylation and other organic synthesis reactions, Xylene is used in paints and coatings, diethyl carbonate, benzene, carbohydrazide, hydrazine methyl formate, and can replace the highly toxic phosgene and polyurethane.

Because DMC is non-toxic, propylene diurethane, used in the production of polycarbonate, anisole and allyl diethylene glycol carbonate, it can be widely used in carbonylated dimethyl carbonate (DMC) is an important organic chemical intermediate.

Summary. What is dimethyl carbonate used for in industry?

Please reply.

Ethyl acetate is commonly used.

1. As an industrial solvent, it is used in coatings, adhesives, ethyl cellulose, artificial leather, linoleum colorants, artificial fibers and other products.

2. As a binder, it is used in the production of printing ink and artificial pearls.

3. As an extracting agent, it is used in the production of medicine, organic acids and other products.

4. As a spice raw material, it is used as the main raw material for pineapple, banana, strawberry and other fruit flavors and whiskey, cream and other high masks and spices. Spice manufacturing, Qi staring can be made of liquor hooked with spices, artificial flavors.

5. Extractant, extracting many compounds (phosphorus, tungsten, arsenic, cobalt) from aqueous solution.

6. Organic solvents. It is used as a reference material for calibration thermometers when separating sugars.

7. Verification of bismuth, gold, iron, mercury, oxidant and platinum.

8. Determination of bismuth, boron, gold, iron, molybdenum, platinum, potassium and thallium.

9. Biochemical research, protein sequence analysis.

10. Environmental protection and pesticide residue analysis.

11. Organic synthesis.

12. It is a fast-drying solvent for nitrocellulose, ethyl cellulose, cellulose acetate and neoprene, and it is also a low-toxicity solvent used in industry.

13. It can also be used as a cleaning agent in the textile industry and an extractant for natural flavors, and is also an important raw material for the pharmaceutical industry and organic synthesis.

14. GB 2760-96 stipulates that edible spices are allowed to be used. It is mainly used for incense, persimmon astringency, granules or tablets for spices, and vinegar ingredients. It is widely used in the preparation of cherry, peach, apricot and other fruit-type Zheng Peishou flavor and brandy and other wine flavors.

Dimethyl carbonate is a plastic that can be synthesized.

Can partial ethyl ester be replaced?

Ethyl ester is the solvent.

The above are their uses, and they definitely don't.

It is not used for fine chemicals, only for solvents.

It's all esters, yes.

Can ethyl ester and dimethyl carbonate be used as a solvent?

Ethyl acetate is generally used as a reaction and crystallization solvent, while dimethyl carbonate is highly reactive and is generally used as a reaction reagent, which is a methylation and carbonylation reagent.

According to the actual situation, according to the activity ratio of the above two.

May I? If you want to make a solvent, you can use dimethyl carbonate directly.

Ethyl acetate is used as a reaction solvent when reacting with other substances.

The total investment and total cost of kt a vinyl carbonate and 150 kt a dimethyl carbonate are shown in table 4.

Table 4 Total investment and total cost of use of the project.

US$ million Projects Ethylene carbonate Dimethyl carbonate (oxidative carbonylation process) Investment within the boundaries Investment outside the boundaries Total capital of the plant Other project investment Total project investment Labor cost Total cost of use The cost analysis of four production processes of DMC at the scale of 150 kt A was carried out, and the variable costs were as follows: urea methanol hydrolysis process USD t, methanol oxidative carbonylation process with nitric oxide as catalyst USD t, methanol oxidative carbonylation process with copper chloride as catalyst USD t, Transesterification process of ethylene carbonate (EC) with methanol USD t. Table 5 shows the variable cost analysis of the methanol oxidation carbonylation process with nitric oxide as a catalyst and the transesterification process of ethylene carbonate and methanol, and Table 6 shows the cost analysis of ethylene carbonate, the main raw material of the transesterification method.

Table 5 Comparison of variable costs for two production processes at 150 kt a DMC.

USD t Project Methanol Oxidative Carbonylation Process Transesterification Process Raw Material Oxygen Methanol CO Ethylene Carbonate Catalyst By-Product Ethylene Glycol Utilities Electricity Cooling Water Steam ( DMC Table 6 kt a Cost Analysis of Ethylene Carbonate.

USD t Project ** Feedstock Ethylene Oxide Carbon Dioxide Catalyst Utilities Electricity Cooling Water Steam ( Variable Costs Cash Costs Product** In the oxidative carbonylation process with nitric oxide as a catalyst, the main raw materials carbon monoxide and methanol** account for 67% of DMC's variable costs and 31% of DMC products**; In the transesterification process, the main raw material ethylene carbonate** is 126% of the variable cost of DMC, the by-product ethylene glycol product ** is 86% of the variable cost of DMC, and ethylene oxide, the main raw material of ethylene carbonate, accounts for 75% of its product**, it can be seen that the ** of ethylene oxide and ethylene glycol is the most important constraint for the product ** of transesterification synthesis of DMC, in addition, the amount of steam used in its utility works is large when the transesterification process is adopted. Therefore, the determinants of the cost of DMC produced by the transesterification process are ethylene oxide and steam**, in addition, the market for the by-product glycol** also significantly restricts the variable cost of DMC. Therefore, it is an important way to reduce the cost of transesterification process by building DMC production base and ethylene oxide production area together and fully exploiting the market potential of ethylene glycol.

Shanghai Petrochemical Co., Ltd. has cooperated with Tsinghua University to develop a new transesterification process for the synthesis of DMC, that is, the use of supercritical carbon dioxide properties to synthesize DMC by one-step reaction of ethylene oxide, methanol and carbon dioxide, which has applied for a patent. This process does not introduce other solvents into the reaction, avoids solvent separation, avoids the separation and purification of ethylene carbonate, simplifies the process, improves the reaction speed and reaction yield, saves energy, and can greatly reduce the cost of DMC transesterification process.

Dimethyl carbonate (DMC) is a non-toxic, excellent environmental performance, widely used chemical raw materials, it is an important organic synthesis intermediate, the molecular structure contains carbonyl, methyl and methoxy and other functional groups, with a variety of reaction properties, in the production has the characteristics of safety, convenience, less pollution, easy transportation. Because dimethyl carbonate is less toxic, it is a promising "green" chemical product.