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A diester, preparation process technology, applied in the field of preparation of diester materials, can solve problems such as leakage and increasing controversy, and achieve the effect of improving productivity
Pending Publication Date: 2022-07-29
LG CHEM LTD
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[0005] However, although phthalate plasticizers have compatibility with PVC and excellent flexibility-imparting properties, recently, for practical use of phthalate plasticizers in PVC products, phthalate The harmfulness of dicarboxylate plasticizers that may leak out of products in bits and pieces as carcinogens at levels of suspected endocrine disruptors (environmental hormones) and heavy metals is increasingly debated
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[0021] According to an exemplary embodiment of the present invention, the diester-based material may be performed through a continuous production process including a reaction section in which a total of n reaction units 10, 20 and n0 are connected in series.
[0022] Specifically, traditionally, in the preparation of diester materials, a batch preparation process is employed. However, the production of diester materials by a batch process has limitations in improving the reflux amount of steam, the productivity is very low, and there are technical limitations to improving the problem.
[0023] In addition, in order to solve the problems of the batch process having the above-mentioned problems, in the production of the diester-based material, a continuous process having a reaction part in which two or more reactors are connected in series has been developed. However, in this case, there are problems in increasing the energy usage, achieving the desired conversion and improving...
Embodiment 1 to 6 and comparative example 1 to 4
[0064] exist figure 2 In the process flow diagram shown, the production of dioctyl terephthalate (DOTP) was simulated using an ASPEN PLUS from Aspen Technology Inc. at 99% conversion.
[0065] Specifically, terephthalic acid and 2-ethylhexanol were introduced into the reactor 11 of the first reaction unit 10 while maintaining a molar ratio of 1:2 to 4.5 to perform esterification in the presence of a catalyst, and for the reactor 11 In the upper effluent stream evaporated, column 12, condenser 13 and layer separator 14 are used to reflux the alcohol to reactor 11 and remove water. Furthermore, the lower discharge stream including the reaction product in the reactor 11 is supplied to the reactor 21 of the second reaction unit 20 .
[0066] The same as the operation flow of the first reaction unit 10, the second reaction unit 20, the third reaction unit 30, the fourth reaction unit 40 and the fifth reaction unit 50 are continuously operated, and the reaction of the fifth reacti...
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Abstract
Provided is a method for preparing a diester-based material, and more specifically, a method for preparing a diester-based material by a continuous diester-based material preparation process including a reaction part in which a total of n reaction units from a first reaction unit to an n-th reaction unit are connected in series, the present invention relates to a method for producing a dicarboxylic acid and an alcohol in a reaction unit comprising a reactor for esterifying the dicarboxylic acid and the alcohol, the method comprising: esterifying the dicarboxylic acid and the alcohol in a reactor of a first reaction unit to produce a reaction product, and supplying a lower discharge stream comprising the reaction product to a reaction unit at a rear end, in which the operating pressure of the reactor of the first reaction unit is 0.4 kg/cm2G to 5.5 kg/cm2G, and the operating pressure of the reactor of the second reaction unit is 0.5 kg/cm2G to 5.5 kg/cm2G; the operating pressure from the reactor of any one of the second reaction unit to the n-th reaction unit to the reactor of the n-th reaction unit is reduced, and the operating temperature from the reactor of the first reaction unit to the reactor of the n-th reaction unit is increased.
Description
technical field [0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority from Korean Patent Application No. 10-2020-0153956 filed on Nov. 17, 2020, the entire contents of which are incorporated herein as a part of the specification. technical field [0003] The present invention relates to a method for producing diester materials, and more particularly, to the ability to increase diesters during continuous production of diester materials by controlling the reaction rates of reactants while minimizing the amount of energy supplied to the reactor. A method of making a diester-like material for the productivity of the like material. Background technique [0004] Phthalate plasticizers accounted for 92% of the global plasticizer market by the 20th century, and are mainly used to impart flexibility, durability, cold resistance, etc. to polyvinyl chloride (PVC) and reduce melt viscosity to improve processing. Additives that can be incorporate...
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