MADE

MADE - Names and Identifiers

Name	Dibasic Esters
Synonyms	DBE MADE IMSOL DIBASIC ACID DIBASIC ESTER Dibasic Esters Dbe Dibasic Ester DBE DIBASIC ESTER Dibasic Esters(DBE) DBE, Dibasic ester mixture Mixed Aliphatic Dimethyl Esters DBE,Dibasic Esters,Dimethyl butanedioate
CAS	95481-62-2
InChIKey	QYMFNZIUDRQRSA-UHFFFAOYSA-N

MADE - Physico-chemical Properties

Molecular Formula	C21H36O12
Molar Mass	480.5
Density	1.19g/mLat 25°C(lit.)
Melting Point	-20°C
Boling Point	196-225°C(lit.)
Flash Point	212°F
Vapor Presure	0.2 mm Hg ( 20 °C)
Storage Condition	Store below +30°C.
Explosive Limit	8%
Refractive Index	n20/D 1.424(lit.)

MADE - Risk and Safety

Risk Codes	R38 - Irritating to the skin R41 - Risk of serious damage to eyes R36 - Irritating to the eyes R36/37/38 - Irritating to eyes, respiratory system and skin. R3 - Extreme risk of explosion by shock, friction, fire or other sources of ignition
Safety Description	S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S39 - Wear eye / face protection. S35 - This material and its container must be disposed of in a safe way.
UN IDs	UN 3265 8/PG 3
WGK Germany	3
HS Code	3824 99 92

MADE - Introduction

divalent acid ester, commonly known as MDBE and methyl nylon acid, is a high boiling point environmental protection solvent. DuPont named DBE, Shounuo named DME, and NME in China. NME is a mixture of three divalent acid esters. It is a combination of three good environmental solvents, succinic acid (dimethyl succinate CH3OOC(CH2)2COOCH3, dimethyl glutarate CH3OOC(CH2)3COOCH3 and dimethyl adipate CH3OOC(CH2)4COOCH3. It is precisely because of this unique composition that NME becomes a non-toxic, it is a biodegradable environment-friendly high boiling point solvent.

Last Update：2024-04-10 22:29:15

MADE - Use

divalent acid esters are widely used in automotive coatings, color steel plate coatings, canned coatings, enameled wire and household electrical materials, furniture wood coatings and other industries. Examples of its application are as follows:

1) Preparation of nano anti-scaling and anti-corrosion coatings for gathering and transportation pipelines, which are applied to anti-scaling and anti-corrosion in petroleum gathering and transportation pipelines. It is characterized in that it is composed of 1 part by weight of agent A and 0.1 to 0.3 parts by weight of agent B, agent A includes bisphenol A epoxy resin, n-butanol, xylene, divalent acid ester, polyether modified polydimethylsiloxane, high molecular weight block copolymer containing pigment affinity group, foam-breaking polysiloxane, polyether siloxane co-polymer, polyacrylate, high molecular weight polycarboxylic acid containing amine derivatives, nano titanium dioxide, nano silicon dioxide, sericite, talc and flake graphite; Among them, agent B includes polyamide. The effect is: the coating has excellent workability and storage stability, and the coating film has excellent anti-fouling performance and excellent corrosion resistance. The scale inhibition rate of pipelines can reach above 80%.

2) an environment-friendly high-performance bait brightener was prepared, which was composed of divalent acid ester, PVC powder, free radical photoinitiator, ethyl acetate, polyvinyl butyral, liquid paraffin and magnetized water. This product uses divalent acid ester and PVC powder as the main raw materials, supplemented by free radical photoinitiator, ethyl acetate, polyvinyl butyral, liquid paraffin and magnetized water, and is refined by advanced production technology. Among them, ethyl acetate and polyvinyl butyral mainly play a role in increasing viscosity, so that the brightener can adhere to the surface of the bait, and ethyl acetate has a fruity smell, which is easy to attract fish for food. The main function of divalent acid ester is to dissolve PVC powder, which has the effects of brightening and improving gloss. It is a degradable and environment-friendly solvent. After the bait brightener is impregnated, heated and dried, the product can present a high-light state, with bright color, lifelike, and high fish lure rate, especially to attract fish in deep waters.

Last Update：2024-04-10 22:29:15

MADE - Production method

(1) continuous catalytic esterification: including the first catalytic esterification and the second catalytic esterification: a first catalytic esterification: according to the mass ratio of nylon acid, methanol and hydrous cerium sulfate catalyst of 1:1.3:0.02, weigh each raw material, add the raw materials nylon acid and methanol to the reaction kettle in sequence, then add the hydrous cerium sulfate catalyst, heat while stirring, heat to 120 ℃, keep the temperature unchanged, the pressure inside the reaction kettle is controlled to be 125KPa, and the reaction is carried out for 1 hour. The aqueous cerium sulfate catalyst is composed of cerium sulfate active component and double mesoporous silicon carrier, wherein the mass percentage of cerium sulfate is 42%, and the balance is double mesopores. The pore size of the small mesopores of the double mesopores is 3-5nm, and the pore size of the large mesopores is 10. B The second catalytic esterification: The reaction is carried out by continuously introducing methanol into the reaction kettle. The water generated by the reaction is brought out with methanol to continue the reaction. The amount of methanol added is the amount of methanol added in the first catalytic esterification. 143%, this reaction stage is an atmospheric reaction. The reaction temperature is controlled by controlling the methanol inlet speed. The reaction temperature at this stage is 130 ℃, keeping the temperature constant, and adding titanate catalysts, the addition amount is 8.2‰ of the total mass of the reactants, and the acid value is measured for 5 hours. When the acid value reaches less than 5mgKOH/g, the temperature is rapidly reduced to 65 ℃, the reaction is stopped, and the crude product is obtained. The titanate catalyst is a mixture of tetraethyl titanate, tetrapropyl titanate and tetraisopropyl titanate, and the mass ratio is 2:5:3.

(2) alkali washing and neutralization: filter and separate the catalyst, slowly add 20% NaHCO3 to the crude product of the reaction kettle, stir at a rate of 100rad/min while adding at a temperature of 85 ℃, stop adding and continue stirring for 10min when the acid value of the crude product is lower than 0.5mgKOH/g; The separated catalyst is reused after simple treatment, and the number of times of use is recorded.

(3) standing at low temperature: place the above products at an ambient temperature of -3 ℃ and stand for 25min. after stratification, the water layer is separated to remove water.

(4) pump the crude product material after water removal into the light removal tower, reduce the pressure to -0.01MPa, set the top temperature to 105 ℃, remove the light components, and circulate the methanol in the light components to the catalytic esterification reactor for reuse after dehydration and impurity removal; The packing layer provided in the light removal tower adopts polypropylene plastic step ring, the diameter of the step ring used is 50mm, and the top part adopts reflux in tube.

(5) put the crude product with light components removed into the weight removal tower, and decompress to remove the heavy components; The pressure after decompression is controlled to-0.085MPa, the top temperature of the weight removal tower is controlled to 125 ℃, the bottom temperature of the tower is controlled to 150 ℃, the reflux ratio is set to 0.7, and the products at the top of the tower are collected. The product processed by the above method, after testing, the color of the product is stable, the chromaticity is light, and the chromaticity is not much different. The main component is NME (dimethyl succinate, dimethyl glutarate and dimethyl adipate) The purity of NME is 99.82%, of which the content of methanol is 0.021%, and the content of mono-methyl ester is 0.012 ‰; after the quality analysis of the various components before, the selectivity of the reaction is 99.83%; the acid value of the product is 0.14mgKOH/g; the moisture content of the product is 0.020%; after the catalyst is used for 30 times, the activity decreases less than 10%, it is stable during use, and has good reuse performance. It is not easy to be poisoned, will not corrode equipment, and will not pollute the environment.

Last Update：2024-04-10 22:29:15

MADE - Reference Information

EPA chemical information	Information provided by: ofmpub.epa.gov (external link)
use	binary ester is used as organic chemical raw material.
spontaneous combustion temperature	698 °F

Last Update：2024-04-09 21:04:16