High-efficiency catalyst for synthesizing di(2-ethylhexyl) terephthalate
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A dioctyl phthalate and catalyst technology, which is applied in the field of catalysts for synthesizing dioctyl terephthalate, can solve the problems of slow esterification reaction speed, large production wastewater, and low esterification rate, and improve product quality , the effect of improving the reaction speed
Inactive Publication Date: 2008-08-06
郭立耀
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Problems solved by technology
[0003] At present, "the process of producing dioctyl terephthalate (DOTP) with terephthalic acid and isooctyl alcohol as raw materials" is: esterification-dealcoholization-neutralization-washing-stripping-filtration, and there is an esterification reaction in this process Defects such as slow speed, low esterification rate, large production wastewater and high energy consumption
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Embodiment 1
[0020] (1) Put terephthalic acid and isooctyl alcohol into the esterification reaction kettle in a weight ratio of 1:2.3~2.8 (example 1:2.3, 1:2.6, 1:2.8), heat while stirring, when the temperature rises When the temperature reaches 160-220°C (for example, 160°C, 190°C, 220°C), add a catalyst corresponding to 0.2-2% of the total weight of terephthalic acid and isooctyl ester (for example, 0.2%, 1%, 2%), and ester The reaction temperature of the reaction is controlled between 180-260° C. (for example, 180° C., 220° C., 260° C.). When the acidity is ≤0.0075%, it is considered that the esterification reaction is over, and the step (2) is entered.
[0021] (2) distill out the esterified water and unnecessary alcohol in the material;
[0022] (3) After the temperature of the material treated in step (2) drops below 130°C, throw it into the filter kettle, add the porous material that plays the role of adsorption and decolorization, and stir for 0.5 to 2 hours (for example, 0.5 hours...
Embodiment 2
[0029] The catalyst is mixed with the following compounds in weight percent:
[0030] (a) Titanium metal compound 65%
[0031] (b) Tin metal compound 30%
[0032] (c) Other metal compounds 5%. All the other are with embodiment 1.
Embodiment 3
[0034] The catalyst is mixed with the following compounds in weight percent:
[0035] (a) Titanium metal compound 80%
[0036] (b) Tin metal compound 10%
[0037] (c) Other metal compounds 10%. All the other are with embodiment 1.
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Abstract
The invention discloses a high efficiency catalyst used for compounding dioctyl phthalate which comprises titanium metal compounds, tin metal compounds, and other metal compounds; among which, the titanium metal compounds are titanic acid four phenyl ester, titanic acid four ethyl ester, silicic acid four alkane ester modified titanate or compound silicon dioxide carrier titanate; the tin metal compounds are stannous oxide, stannous oxalate, acetate diethyl tin, or dibutyl didodectyl acid tin; other metal compounds are ethylene glycol antimony, sodium aluminate, aluminum oxide, aluminum hydrous oxide plus sodium hydroxide, manganese oxide, cobalt oxide, antimony trioxide or zinc oxide. The catalyst used for compounding dioctyl phthalate of the invention has the advantages of improving reaction speed (Reaction time is improved within 3 hours from more than 8 hours in original technology), having a thorough esterification, and improving the quality of the product.
Description
Technical field: [0001] The invention relates to a catalyst for synthesizing dioctyl terephthalate. Background technique: [0002] Dioctyl terephthalate is an important polyvinyl chloride (PVC) resin plasticizer with excellent performance, which has excellent chemical stability, heat resistance, cold resistance, low volatility and high electrical insulation properties And other advantages, can be widely used in cables, PVC plastics, high-grade artificial leather, rubber products and other fields. [0003] At present, "the process of producing dioctyl terephthalate (DOTP) with terephthalic acid and isooctyl alcohol as raw materials" is: esterification-dealcoholization-neutralization-washing-stripping-filtration, and there is an esterification reaction in this process The disadvantages are slow speed, low esterification rate, large production wastewater and high energy consumption. Invention content: [0004] The object of the present invention is to provide a kind of high...
Claims
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