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A kind of dop continuous production process and used equipment

A production process and equipment technology, applied in the field of production process and equipment used, can solve the problems of high energy consumption and limited production capacity of a single set, and achieve the effects of low energy consumption, reduced energy consumption, and increased production output

Inactive Publication Date: 2011-12-28
浙江庆安化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The capacity of a single set of plasticizer continuous equipment currently in operation in China is limited, and the energy consumption is relatively high

Method used

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  • A kind of dop continuous production process and used equipment
  • A kind of dop continuous production process and used equipment
  • A kind of dop continuous production process and used equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Heating isooctyl alcohol to about 180°C, with 10 m 3 / h flow rate into the first esterification tank 101, after adding 5m3, start the agitator. Open the steam control valve, the first esterification kettle 101 isooctyl alcohol is slowly warmed up to 184 ℃, open the steam control valve of the second esterification kettle 102 to the sixth esterification kettle 106 simultaneously, control the temperature of these three reactors at Above 184°C, to avoid condensation of alcohol vapor in it, after adding octanol to the first esterification kettle 101 for 1 hour, determine the feeding ratio and input phthalic anhydride (4T / h) and catalyst 4.3Kg / h (catalyst pump stroke: 3.0) to start the catalyst Feed: control the temperature of the first esterification tank 101 to carry out the esterification reaction at 190°C, the alcohol and water vapor distilled from the top of the first esterification tower 107 are cooled by the first cooler 108, and the condensed alcohol-water ...

Embodiment 2

[0031] Embodiment 2: Dealcoholization process: a. Utilize the residual heat of reaction materials, and separate most of excess alcohol through decompression flash evaporation; b. Reduce the emulsification factor of neutralization and washing, which is beneficial to the phase separation of neutralization and washing; c. Recover Part of octanol is used for esterification.

[0032] Put the crude ester of the esterification product obtained in Example 1 into the alcohol-ester heat exchanger 5 through the crude ester pump 4, and add another pipeline through low-temperature alcohol to perform heat exchange, initially cool the temperature of the crude ester, and then enter the The temperature in the ester cooler 6 is further lowered to about 95°C, and it is added to the dealcoholization tower. Under the condition of an absolute pressure of 5KPa, the temperature at the bottom of the tower is set at 190°C, and the temperature at the top of the tower is set at 170°C. Excess alcohol is ev...

Embodiment 3

[0033] Example 3: Neutralization and washing process: Tasks of this section: a. Use the waste heat of the reaction materials to separate most of the excess alcohol through decompression flash evaporation; b. Reduce the emulsification factor of neutralization and washing, which is beneficial to neutralization and washing phase separation; c. reclaim part of octanol for esterification.

[0034] In Example 2, the tower bottoms that have been dealcoholized and cooled to 95°C are sent to the neutralization tank 7, and the dilute solution diluted to 0.4% by 30% NaOH is added, and the temperature is raised to 90°C before being added to the neutralization tank , Stirring and neutralization reaction at a temperature of 95 ° C, until the acid value in the ester phase ≤ O. 05mgKOH / g, the pH value of the water phase is 11-12, after the reaction is completed, the ester phase enters the water washing kettle 8, and the water at 95°C whose mass is 20-30% of the ester content is added for wash...

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Abstract

The invention relates to a continuous production process for DOP (Dioctyl Phthalate) and used equipment, which belong to the technical field of fine chemical production. The continuous production process comprises the following steps of: firstly carrying out esterification reaction of phthalic anhydride and isooctyl alcohol in the presence of a catalyst such as titanate, and then carrying out dealcoholization, neutralization and water washing, steam stripping and drying, adsorption and filtration to obtain the DOP. In the invention, by adopting six esterification kettles which are connected in series and have completely the same structure for the esterification reaction, alcohol is kept excessive, the conversion rate is high and is larger than 99.5 percent, the acid value of coarse ester generated in the reaction is less than or equal to 0.3mgKOH / g, and the excessive alcohol accounts for 16 percent; by using the equipment, a production method with low energy consumption, high production capacity and continuous esterification is obtained, the conversion rate is high, the production quantity of a device is improved, the production cost is lowered, and the continuous production process is suitable for industrialized production; the excessive alcohol and the water generated in an esterification stage are recycled and comprehensively recovered, so that the generation of three wastes is reduced; and the production capacity of the DOP is enlarged by 50 percent as compared with a single set of domestic device, and the consumption of energy sources is decreased by 20 percent.

Description

technical field [0001] The invention belongs to the technical field of fine chemical production, and in particular relates to a production process for continuous production of DOP and used equipment. Background technique [0002] At present, the methods of producing plasticizers at home and abroad are mainly continuous production process and batch production process. The continuous process is mainly reflected in the high degree of automation of the device, large production capacity, stable product quality, low raw material consumption and energy consumption, and easy operation. At the same time, it can also produce a variety of plasticizer products with similar raw material properties. The intermittent production process has a low degree of automation, large fluctuations in product quality, large consumption of raw materials and energy, complex operations, and relatively small output, but the switching between other varieties is convenient and fast. The single set of plasti...

Claims

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Application Information

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IPC IPC(8): C07C69/80C07C67/08
Inventor 姚宁程顺国李洪波段文平李善承田如周
Owner 浙江庆安化工有限公司
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