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A technology of trioctyl trimellitate and a production method, which are applied in the field of organic chemical raw material manufacturing to achieve the effects of reducing time, improving production efficiency, and reducing filtration processes
Inactive Publication Date: 2015-12-23
黄裕兵
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TiO 2 It is doubtful whether it can play a catalytic role in the esterification reaction of trimellitic anhydride and octanol, and this method does not mention the use of nitrogen protection during the reaction process, strict control of the chromaticity of trimellitic anhydride raw materials and other measures to achieve adsorption without activated carbon Decolorization can produce trioctyl trimellitate whose color meets the requirements
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Embodiment 1
[0040] The production method of trioctyl trimellitate, the steps comprise:
[0041] (1) Put 18m in an esterification kettle 3 octanol, start stirring, then drop into 7000kg of trimellitic anhydride with a content of 97.2%, and the melting chroma is 60 platinum-cobalt color number, stir for 60min, so that trimellitic anhydride is dissolved in octanol;
[0042] (2) Nitrogen is passed into the first esterification kettle, and the flow rate of nitrogen is controlled to be 1.8Nm 3 / h, replace the air in the kettle with nitrogen, pass the steam into the heating coil of the first esterification kettle, heat the first esterification kettle, set the target temperature to 120°C, when the actual temperature of the material in the first esterification kettle When it reaches 119°C, close the steam inlet valve of the steam, and then it will be observed that as the monoesterification reaction proceeds, the heat released by the reaction will make the actual temperature of the material in the...
Embodiment 2
[0053] The production method of trioctyl trimellitate, the steps comprise:
[0054] (1) Put 18m in an esterification kettle 3 Octanol, start stirring, then drop into 7152kg of trimellitic anhydride with a content of 95.13%, and the melting chroma is 100 platinum-cobalt color number, stir for 60min, so that trimellitic anhydride can be dissolved in octanol;
[0055] (2) Nitrogen is passed into the first esterification kettle, and the flow rate of nitrogen is controlled to be 1.8Nm 3 / h, replace the air in the kettle with nitrogen, pass the steam into the heating coil of the first esterification kettle, heat the first esterification kettle, set the target temperature to 120°C, when the actual temperature of the material in the first esterification kettle When it reaches 119°C, close the steam inlet valve, and then it will be observed that as the monoesterification reaction proceeds, the heat released by the reaction will make the actual temperature of the material in the kettle...
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Abstract
The invention discloses a production method for trioctyl trimellitate. In order to control the quality of trimellitic anhydride serving as a raw material, nitrogen protection is adopted during a production process; a small amount of titanate-like catalyst is added under the conditions that a secondary esterification reaction is completed and water serving as a reaction by-product is removed so that the esterification reaction is performed completely, and the product standards of the synthesized product can meet the requirements of a superior product in the index aspects, such as the chromaticity and the acid value, without being absorbed and de-colored by activated carbon without neutralizing or only by adding a small amount of neutralizing agent; therefore, the problems that the chromaticity is influenced by the existence of tiny activated carbon particles and the addition of a large amount of the neutralizing agent and a large amount of salt residues in the product of the product in downstream application are avoided. When the raw material purity of the trimellitic anhydride is not high, or the acid value of the product exceeds the standard slightly caused by the reasons that acid regurgitation appears in the process of adding water to break the titanate-like catalysts and the like, and remediation can also be performed through a given post-processing method.
Description
technical field [0001] The invention relates to a production method of a plasticizer, in particular to a production method of a trioctyl trimellitate plasticizer, and belongs to the field of organic chemical raw material manufacturing. Background technique [0002] Trioctyl trimellitate is the same as some other common plasticizers, because it is liquid at room temperature, it is easy to transport and use, and in addition, this type of ester has a high boiling point, low volatility, moderate molecular weight, and the molecule contains some Branched chain is very good for improving the plasticity and softness of plastic and rubber, so it is often used as a plasticizer. [0003] With the official implementation of the RoHS2.0 (2011 / 65 / EU) regulation by the European Union since January 2013, dioctyl phthalate (DEHP), dibutyl phthalate (BBP) and phthalic acid Butylbenzyl ester (DBP) and other plasticizers used in larger quantities are listed as priority hazardous substances, an...
Claims
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