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Continuous alcohol-removing device and alcohol-removing method of di-sec-octyl phthalate

A technology of di-sec-octyl phthalate and dealcoholization, which is applied in the continuous dealcoholization device and the field of continuous dealcoholation, can solve the problem of restricting the development of di-sec-octyl phthalate, unable to realize large-scale production and intermittent de-alcoholization. The problem of high energy consumption of alcohol can achieve the effect of stable and uniform product quality, smooth process operation and good dealcoholization effect.

Inactive Publication Date: 2011-09-07
WEIFANG YUANLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing intermittent dealcoholization device and dealcoholization production process have the following disadvantages: (1) the heating time is long, the product quality fluctuates greatly, and the operation is unstable; (2) the equipment and technology are backward, and the labor intensity of workers is high; The alcohol effect is poor, and the material purity is low; (4) the energy consumption of intermittent dealcoholization is high, the scale is small, and it is impossible to realize large-scale production, which restricts the development of di-sec-octyl phthalate

Method used

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  • Continuous alcohol-removing device and alcohol-removing method of di-sec-octyl phthalate

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Open the vacuum system of the dealcoholization tower and the stripping tower, open the heating valve to heat the evaporator of the dealcoholization tower, and the materials obtained by the esterification reaction (including di-sec-octyl phthalate and unreacted sec-octyl alcohol) Enter from the material inlet on the upper part of the dealcoholization tower, the feed amount is from small to large, the material temperature in the dealcoholization tower is 170°C, the relative pressure is -0.083MPa, the gas phase temperature at the top of the dealcoholization tower is >90°C, and the relative pressure is -0.084 Pre-dealcoholization is carried out at MPa, and the released secondary octanol is discharged through the outlet of the dealcoholization gas phase, and is condensed by the condenser and then recovered to the dealcoholization receiving tank. reaction. The two dealcoholization receiving tanks and the two stripping receiving tanks connected in parallel are switched for use...

Embodiment 2

[0038]Open the vacuum system of the dealcoholization tower and the stripping tower, open the heating valve to heat the evaporator of the dealcoholization tower, and the materials obtained by the esterification reaction (including di-sec-octyl phthalate and unreacted sec-octyl alcohol) Enter from the material inlet on the upper part of the dealcoholization tower, the feed amount is from small to large, the material temperature in the dealcoholization tower is 172°C, the relative pressure is -0.085MPa, the gas phase temperature at the top of the dealcoholization tower is >90°C, and the relative pressure is -0.086 Pre-dealcoholization is carried out at MPa, and the released secondary octanol is discharged through the outlet of the dealcoholization gas phase, and recovered to the dealcoholization receiving tank after being condensed by the condenser. After the recovered secondary octanol is recovered, it returns to the esterification process to participate in the esterification reac...

Embodiment 3

[0041] Open the vacuum system of the dealcoholization tower and the stripping tower, open the heating valve to heat the evaporator of the dealcoholization tower, and the materials obtained by the esterification reaction (including di-sec-octyl phthalate and unreacted sec-octyl alcohol) Enter from the material inlet on the upper part of the dealcoholization tower, the feed amount is from small to large, the material temperature in the dealcoholization tower is 176°C, the relative pressure is -0.08MPa, the gas phase temperature at the top of the dealcoholization tower is >90°C, and the relative pressure is -0.084 Pre-dealcoholization is carried out at MPa, and the released secondary octanol is discharged through the outlet of the dealcoholization gas phase, and recovered to the dealcoholization receiving tank after being condensed by the condenser. After the recovered secondary octanol is recovered, it returns to the esterification process to participate in the esterification reac...

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Abstract

The invention discloses a continuous dealcoholizing device and dealcoholizing method of di-sec-octyl phthalate. The dealcoholizing device comprises an dealcoholizing tower and a stripping tower which are connected in series. The dealcoholizing method comprises the following steps: the material obtained through esterification enters the dealcoholizing tower first to re-dealcoholize under the conditions that the material temperature is 160-180 DEG C, the relative pressure is from -0.08MPa to -0.09 MPa, the top gas-phase temperature is more than 90 DEG C and the relative pressure is no more than -0.084MPa; the re-dealcoholized material enters the stripping tower to dealcoholize under the conditions that the material temperature is 160-180 DEG C, the relative pressure is from -0.083MPa to -0.09MPa, the top gas-phase temperature is 120-170 DEG C and the relative pressure is no more than -0.088MPa; and introducing saturated steam in a saturated steam distributor to perform stripping. In the invention, the continuous dealcoholizing production method is adopted; and the residence time of the material in the device is short, the energy consumption is low, the product purity is high, the quality is stable, and the quality and production efficiency of di-sec-octyl phthalate can be increased.

Description

technical field [0001] The invention relates to the technical field of plasticizer production, in particular to a continuous dealcoholization device in the production process of di-sec-octyl phthalate and a method for using the device to carry out continuous dealcoholization. Background technique [0002] Di-sec-octyl phthalate (DCP) is a kind of plasticizer. It is an excellent plasticizer with good comprehensive properties. It has good compatibility, high plasticizing efficiency, and its performance is similar to o-phthalic acid Dioctyl dicarboxylate (DOP) has good heat resistance, light resistance, weather resistance and electrical insulation. It can usually be used as a substitute for DOP. It is especially suitable for plasticizers. It has good viscosity stability and is widely used. It is used in the processing of cable materials, tapes and polyvinyl chloride resin, etc. The production method of di-sec-octyl phthalate (DCP) is currently produced by batch dealcoholizatio...

Claims

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Application Information

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IPC IPC(8): C07C69/80C07C67/54
Inventor 杨辉刘金玲谭立文
Owner WEIFANG YUANLI CHEM
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