CN204174127U - The continuous rectification system of two-(2-chloro isopropyl) ether is extracted from epoxy propane slop - Google Patents

Abstract

A kind of continuous rectification system extracting two-(2-chloro isopropyl) ether from epoxy propane slop of the utility model, it is characterized in that: comprise lights column connected system and product tower connected system, discharge port at the bottom of lights column tower connects lights column column bottoms pump entrance, and the outlet of lights column column bottoms pump connects product tower opening for feed.The method that the utility model provides extracts the system of two-(2-chloro isopropyl) ether from epoxy propane slop, adopts continuous rectificating technique, does not need to add entrainer water, avoid the problem of equipment corrosion.

Description

The continuous rectification system of two-(2-chloro isopropyl) ether is extracted from epoxy propane slop

Technical field

The utility model belongs to rectifying field, particularly relates to a kind of continuous rectification system extracting two-(2-chloro isopropyl) ether from epoxy propane slop.

Background technology

At present, China's production of propylene oxide mainly adopts chlorohydrination, the by product that this process produces contains 50-85% (wt) 1,2-propylene dichloride and 5-20% (wt) two-(2-chloro isopropyl) ether, in addition, also component is planted containing a small amount of propylene oxide, propylene chlorohydrin, allyl group chlorine water and some unknown aldehyde, ketone etc. more than 30.Because this byproduct compounds is complicated, separating difficulty is large, and yellowish, irritating smell are comparatively large, and most domestic production of propylene oxide producer can only it can be used as low side solvent sell or burn.Along with the fierceness day by day that environmental requirement increasingly stringent and Enterprise business are competed, some scholars and research institution are studied extracting propylene dichloride from epoxy propane slop, but the research of extracting two-(2-chloro isopropyl) ether from epoxy propane slop is less.

Two-(2-chloro isopropyl) ether solubility property is better than propylene dichloride, it is the senior solvent being used as rubber and resin and ethyl cellulose etc., there is very high added value, extract from epoxy propane slop reclaim by product two-(2-chloro isopropyl) ether, pollution can be greatly reduced, reduce raw material and energy consumption, thus strengthen the competitive power of enterprise.

Chinese patent CN1513826A discloses a kind of method that azeotropic distillation extracts two-(2-chloro isopropyl) ether from epoxy propane slop, other entrainer in addition to water that the method provides is difficult to be separated with two-(2-chloro isopropyl) ether, is difficult to obtain practical application.And when adopting water to be entrainer, a large amount of chlorine-containing compounds in waste liquid can be hydrolyzed production hydrochloric acid at rectification temperature 90-115 DEG C, serious to equipment corrosion, azeotropic distillation also can produce a large amount of waste water simultaneously.At present, there is no the report of the continuous rectification separation method extracting two-(2-chloro isopropyl) ether from propylene oxide by chlorohydrination waste liquid.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art part, provides one to provide and can realize automatic control, runs continuously, process cost is low, without equipment corrosion, simple, the efficient a kind of continuous rectification system extracting two-(2-chloro isopropyl) ether from epoxy propane slop of extraction element.

The purpose of this utility model is achieved through the following technical solutions:

A kind of continuous rectification system extracting two-(2-chloro isopropyl) ether from epoxy propane slop, it is characterized in that: comprise lights column connected system and product tower connected system, discharge port at the bottom of lights column tower connects lights column column bottoms pump entrance, the outlet of lights column column bottoms pump connects product tower opening for feed, and the structure of two systems is as follows:

Wherein, the annexation of lights column connected system is: epoxy propane slop pump connects preheater, preheater connects lights column liquor inlet, connects reboiler bottom lights column, and discharge port at the bottom of lights column tower connects product tower feed liquid port via lights column column bottoms pump; A lights column secondary condenser is connected again after lights column top vapour outlet first connects lights column first-stage condenser; Lights column first-stage condenser condensate outlet connects lights column return tank entrance, and lights column secondary condenser condensate outlet connects light constituent storage tank; The outlet of lights column return tank connects lights column reflux pump entrance, and lights column reflux pump outlet side connects lights column refluxing opening, and opposite side connects light constituent storage tank;

Wherein, the annexation of product tower connected system is: product tower bottom connects product tower reboiler; Discharge port at the bottom of product tower tower connects product tower column bottoms pump, and product tower column bottoms pump connects pre-heater inlet, and preheater outlet connects heavy constituent storage tank V3; Product column overhead vapour outlet first connects product tower first-stage condenser, then connects product tower secondary condenser; Product tower first-stage condenser is connected product tower return tank with the condensate outlet of product tower secondary condenser, product tower return tank connects product tower reflux pump entrance, product tower reflux pump outlet side connects two-16 pairs, (2-chloro isopropyl) ether water cooler-(2-chloro isopropyl) ether storage tank, and opposite side connects product tower refluxing opening.

Advantage of the present utility model and positively effect are:

1, the system that the utility model provides can extract two-(2-chloro isopropyl) ether from epoxy propane slop, adopts continuous rectificating technique, does not need to add entrainer water, avoid the problem of equipment corrosion.

2, the rectifying related in the distillation system that the utility model provides is for running continuously, and production efficiency is high, constant product quality, and energy and propylene oxide by chlorohydrination full scale plant run continuously.

3, the system that the utility model provides is suitable for suitability for industrialized production, and obtain two-(2-chloro isopropyl) ether product water white transparency after separation, have no irritating odor, purity can reach 95-98% (wt), yield 90-95%.

Accompanying drawing explanation

Fig. 1 structural representation of the present utility model.

Embodiment

Below in conjunction with embodiment, the utility model is further illustrated; Following embodiment is illustrative, is not determinate, can not limit protection domain of the present utility model with following embodiment.

A kind of continuous rectification system extracting two-(2-chloro isopropyl) ether from epoxy propane slop, comprise lights column 3 connected system and product tower 10 connected system, discharge port at the bottom of lights column tower connects lights column column bottoms pump 9 entrance, the outlet of lights column column bottoms pump connects product tower opening for feed, and the structure of two systems is described below respectively:

Wherein, the annexation of lights column connected system is: epoxy propane slop pump 1 connects preheater 2, preheater connects lights column liquor inlet, connects reboiler 4 bottom lights column, and discharge port at the bottom of lights column tower connects product tower feed liquid port via lights column column bottoms pump; A lights column secondary condenser 6 is connected again after lights column top vapour outlet first connects lights column first-stage condenser 5; Lights column first-stage condenser condensate outlet connects lights column return tank 7 entrance, and lights column secondary condenser condensate outlet connects light constituent storage tank V1; The outlet of lights column return tank connects lights column reflux pump 8 entrance, and lights column reflux pump outlet side connects lights column refluxing opening, and opposite side connects light constituent storage tank V1;

Wherein, the annexation of product tower connected system is: product tower bottom connects product tower reboiler 11; Discharge port at the bottom of product tower 10 tower connects product tower column bottoms pump 17, and product tower column bottoms pump connects pre-heater inlet, and preheater outlet connects heavy constituent storage tank V3; Product column overhead vapour outlet first connects product tower first-stage condenser 12, then connects product tower secondary condenser 13; Product tower first-stage condenser 12 is connected product tower return tank 14 with the condensate outlet of product tower secondary condenser 13, product tower return tank connects product tower reflux pump 15 entrance, product tower reflux pump outlet side connects two-16 pairs, (2-chloro isopropyl) ether water cooler-(2-chloro isopropyl) ether storage tank V2, and opposite side connects product tower refluxing opening.

What the utility model provided extract from propylene oxide by chlorohydrination waste liquid two-(2-chloro isopropyl) ether continuous rectification system, its operation steps is as follows:

(1) preheating: the epoxy propane slop A extracting propylene dichloride sends into epoxy propane slop preheater 2 by waste drains pump 1, the heavy constituent heat exchange of extraction at the bottom of waste liquid and product tower tower in this preheater.

(2) rectifying removal of impurities: the waste liquid after preheating enters lights column 3 and carries out rectifying, and the tower reactor of described lights column is heated by lights column reboiler 4; Controlling tower top working pressure is 0.1 ~ 101.33KPa, and reflux ratio is 0.1-20, and bottom temperature is 80-190 DEG C, and tower top temperature is 30-100 DEG C, and tower top distillates the mixing steam containing propylene dichloride, propylene chlorohydrin etc.;

(3) mixing steam cooling is reclaimed: the described mixing steam containing propylene dichloride, propylene chlorohydrin etc. enters lights column first-stage condenser 5 water coolant partial condensation, and liquid phase enters lights column return tank 7 by gravity; Uncooled vapour phase enters the lights column secondary condenser 6 5-10 DEG C of whole condensation of refrigerated water, and liquid phase enters light constituent storage tank V1 by gravity.The vapor phase exit temperature of described lights column first-stage condenser controls at 35-45 DEG C, and the liquid-phase outlet temperature of described lights column secondary condenser controls at 25-35 DEG C;

(4) reflux: lights column reflux pump 8 (or by gravity) is by the reflux ratio of the material in described lights column return tank according to regulation, and a part sends lights column backflow back to, and another part extraction is to light constituent storage tank V1;

(5) target product rectifying: described lights column kettle material is delivered to product tower 10 by lights column column bottoms pump 9 and carries out rectifying.The tower reactor of described product tower is heated by product tower reboiler 11.Controlling product tower top working pressure is 0.1 ~ 101.33KPa, reflux ratio 0.1-10, bottom temperature 80-200 DEG C, tower top temperature 60-180 DEG C, and tower top distillates two-(2-chloro isopropyl) ether steam;

(6) target product condensation: described two-(2-chloro isopropyl) ether steam enters product tower first-stage condenser 12 and uses water coolant partial condensation, liquid phase enters product tower return tank 14 by gravity; Uncooled vapour phase enters product tower secondary condenser 13, and with the 5-10 DEG C of whole condensation of refrigerated water, liquid phase enters lights column return tank by gravity.The vapor phase exit temperature of described product tower first-stage condenser controls at 50-120 DEG C, and the liquid-phase outlet temperature of described product tower secondary condenser controls at 35-45 DEG C;

(7) product reflux: product tower reflux pump 15 (or by gravity) is by the reflux ratio of the material in described product tower return tank according to regulation, part thing sends the backflow of product tower back to, another part sends into two-(2-chloro isopropyl) ether storage tank V2 after delivering to two-(2-chloro isopropyl) ether water cooler 16 water quench to 45 DEG C;

(8) tower bottom reason: described product tower tower reactor heavy constituent, by after the extraction of product tower column bottoms pump 17, is delivered to after described epoxy propane slop preheater 2 is cooled to 45 DEG C, sent into heavy constituent storage tank V3.

Concrete rectifying example

Adopt this continuous rectification system, the step of operation is as follows:

(1) preheating: by the extraction of 500kg/h the epoxy propane slop of propylene dichloride sent into the heavy constituent heat exchange of extraction at the bottom of waste liquid preheater and product tower tower by waste drains pump.

(2) rectifying removal of impurities: the epoxy propane slop after preheating enters lights column and carries out rectifying.Controlling lights column tower top working pressure is 0.1KPa, and reflux ratio is 0.1.Bottom temperature 80 DEG C, tower top temperature is 30 DEG C.

(3) mixing steam cooling is reclaimed: after the mixing steam of the propylene dichloride, propylene chlorohydrin etc. of tower top enters lights column first-stage condenser water coolant partial condensation, liquid phase enters lights column return tank by gravity; Uncooled vapour phase enters lights column secondary condenser with after 5 DEG C of whole condensations of refrigerated water, and liquid phase enters light constituent storage tank by gravity.

(4) reflux: 20kg/h material returns lights column in, by 200kg/h material extraction to light constituent storage tank by lights column by gravity according to the reflux ratio of regulation by the material in lights column return tank.

(5) the lights column kettle material of target product rectifying: 300kg/h is delivered to product tower by lights column column bottoms pump and carries out rectifying.Controlling product column overhead working pressure is 0.1KPa, reflux ratio 0.1, bottom temperature 80 DEG C, tower top temperature 60 DEG C.

(6) target product condensation: tower top distillate two-after (2-chloro isopropyl) ether steam enters product tower first-stage condenser water coolant partial condensation, liquid phase enters product tower return tank by gravity; Uncooled vapour phase enters product tower secondary condenser with after 5 DEG C of whole condensations of refrigerated water, and liquid phase enters product tower return tank by gravity.

(7) product reflux: the material of 25kg/h returns in product tower according to the reflux ratio of regulation by gravity by the material in product tower return tank, the material of 250kg/h is delivered to two-(2-chloro isopropyl) ether water cooler, with after water quench to 45 DEG C, send into two-(2-chloro isopropyl) ether storage tank.

(8) tower bottom reason: the product tower tower reactor heavy constituent of 50kg/h, by delivering to after epoxy propane slop preheater cools after the extraction of product tower column bottoms pump, sends into heavy constituent storage tank.Products obtained therefrom purity 95%, yield 90%.

Claims (1)

1. one kind is extracted the continuous rectification system of two-(2-chloro isopropyl) ether from epoxy propane slop, it is characterized in that: comprise lights column connected system and product tower connected system, discharge port at the bottom of lights column tower connects lights column column bottoms pump entrance, the outlet of lights column column bottoms pump connects product tower opening for feed, and the structure of two systems is as follows:

Wherein, the annexation of lights column connected system is: epoxy propane slop pump connects preheater, preheater connects lights column liquor inlet, connects reboiler bottom lights column, and discharge port at the bottom of lights column tower connects product tower feed liquid port via lights column column bottoms pump; A lights column secondary condenser is connected again after lights column top vapour outlet first connects lights column first-stage condenser; Lights column first-stage condenser condensate outlet connects lights column return tank entrance, and lights column secondary condenser condensate outlet connects light constituent storage tank; The outlet of lights column return tank connects lights column reflux pump entrance, and lights column reflux pump outlet side connects lights column refluxing opening, and opposite side connects light constituent storage tank;

Wherein, the annexation of product tower connected system is: product tower bottom connects product tower reboiler; Discharge port at the bottom of product tower tower connects product tower column bottoms pump, and product tower column bottoms pump connects pre-heater inlet, and preheater outlet connects heavy constituent storage tank V3; Product column overhead vapour outlet first connects product tower first-stage condenser, then connects product tower secondary condenser; Product tower first-stage condenser is connected product tower return tank with the condensate outlet of product tower secondary condenser, product tower return tank connects product tower reflux pump entrance, product tower reflux pump outlet side connects two-16 pairs, (2-chloro isopropyl) ether water cooler-(2-chloro isopropyl) ether storage tank, and opposite side connects product tower refluxing opening.