Model No.: LYN
Carboxyl No.: Dicarboxylic Acid
Alkyl No.: Unsaturated Acid
CAS Number: 141-05-9
Molecular Formula: C8H12O4
Molecular Weight: 172.18
Density: 1.064 G/mL At 25 °C(lit.)
Boiling Point: 225 °C(lit.)
Melting Point: −10 °C(lit.)
FP: 200 °F
Name: Diethyl Maleate
Packaging: as your requirement
Productivity: 200000 tons per Year
Place of Origin: Shandong, China (Mainland)
Supply Ability: in stock
Certificate: ISO CE
HS Code: 141-05-9
Good quality Diethyl maleate CAS 141-05-9
|Application||Solvents, pesticides, polymer monomers, plastic additives.|
Diethyl maleate is an intermediate of a polymer compound monomer, a pesticide, a pharmaceutical, a fragrance, and a water quality stabilizer (organic polycarboxylic acid phosphonic acid compound). Mainly used in the production of organophosphorus pesticide malathion (marathon).
Use It is used in the preparation of organophosphate insecticide malathion in pesticides. It is also an intermediate for pharmaceuticals, perfumes and water stabilizers (organic polycarboxylic acid phosphonic acid compounds); it can also be used to produce spices.
Use to determine ammonia and potassium. Gas chromatographic fixative (maximum use temperature 40 ° C, solvent benzene, chloroform, ethanol). Solvents, plasticizers, organic synthesis, insecticides, high polymer monomers, plastic additives for resins and nitrocellulose.
Use as a pesticide intermediate for the preparation of organophosphorus pesticide malathion, also used in the production of spices
The production method is obtained by esterification of maleic anhydride and ethanol in the presence of sulfuric acid; and can also be obtained by exchange conversion of a cation exchange resin as a catalyst. The industrial product content of diethyl maleate is ≥98%, and the product consumes 585 kg of maleic anhydride (95%) and 604 kg of ethanol (95%) per ton of product.
Production method The preparation method is mainly prepared by esterification of maleic anhydride and ethanol in the presence of sulfuric acid.
This process has two kinds of benzene esterification and phenol-free esterification under normal pressure.
(1) Benzene esterification at atmospheric pressure
A certain amount of benzene and ethanol are added to the esterification reaction pot, maleic anhydride is added, concentrated sulfuric acid is added dropwise under stirring, and steam is heated by a jacket, and the reactant is subjected to esterification reaction at about 75 °C. The produced water is removed by ternary azeotropic distillation with benzene and ethanol, and the upper layer of benzene and ethanol are returned to the reaction vessel. After about 13~14 hours, when the temperature of the top of the distillation column rises to 68.2 °C, the water level in the lower layer of the separator no longer rises, indicating that the water in the reaction pot has completely evaporated, and the esterification reaction is completed. The reflux was stopped, and distillation was continued to 95 to 100 ° C, and benzene and ethanol were distilled off. The mixture was cooled to a temperature of about 50 ° C, neutralized with a 5% aqueous sodium carbonate solution, and after washing with water, the residual benzene and ethanol were removed in vacuo to obtain the product diethyl maleate.
(2) Negative pressure without phenyl esterification
The maleic anhydride and the ethanol are esterified under the action of sulfuric acid, and the ethanol and the water formed by the reaction are taken out in a gaseous state under a certain vacuum and temperature, and then the ethanol is refluxed and esterified by a fractionation tower to make the reaction tend to be complete. This method can shorten the reaction cycle, improve the yield and product quality, and improve the operating environment. Most domestic manufacturers use this method.
Further, it is also possible to carry out exchange conversion with a cation exchange resin as a catalyst to obtain diethyl maleate.
Packaging & Shipping
Logistics transportation methods can be divided into various ways according to the different transportation means.
Different transportation ways had different features.We will consider wholelly and decide according to cargo situation,cargo type,delivery period,transportation cost.
Iron drum & plastic drum packaging
• 200kg/drum&plastic drum
• 180kg/drum&plastic drum
• 25kg/plastic drum&Cardboard bucket
Plastic bag & kraft paper bag
• 50kg/plastic bag
• 25kg/plastic bag&kraft paper bag
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why choose us ?
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Q1: Can I get some samples ?
A: Yes, we can supply the free sample, but the shipping cost be paid by customers.
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Q3: What`s your MOQ ?
A : Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.