CN2305235Y

CN2305235Y - Short distance still type evaporating refining device

Info

Publication number: CN2305235Y
Application number: CN 97227049
Authority: CN
Inventors: 林泰明; 李吉春; 龚渊泉; 任荣康; 张纪忠
Original assignee: CHEMICAL INST LANZHOU CHEMICAL; China Petrochemical Corp; Sinopec Lanzhou Chemical Industry Co
Current assignee: Lanzhou Chemical Industry Co.,China National Petroleum Corp.
Priority date: 1997-09-23
Filing date: 1997-09-23
Publication date: 1999-01-27
Anticipated expiration: 2007-09-23

Abstract

The utility model relates to a short distance still type evaporating refining device which is characterized in that a diversion weir type spiral slot is welded on the heating wall of a still type evaporator, and the cross section of the slot forms a V shape. The still type evaporating refining device is especially suitable for an evaporating and purifying process with a high boiling point, thermal sensitivity, low viscosity, good fluidity and high evaporating rate for the refining and purifying of an N-phenyl group maleimide, and the purifying yield can reach above 98 percents.

Description

A kind of still formula evaporation treater of short distance

The utility model relates to a kind of refining equipment for purifying of evaporation of efficient short distance, particularly is applicable to the still formula evaporation equipment for purifying of the material of higher boiling, thermal sensitivity, high steam rate.

The kestner long-tube evaporator of using always in the prior art, comprise and rise membrane type, falling film type and scraper-type evaporimeter, although the time of staying that has is short, be suitable for handling heat-sensitive substance, have the high characteristics of heat transfer efficiency, but exist the not high shortcoming of steam rate one time, a general steam rate can only reach 20～40%, and present still formula evaporation equipment can reach the high requirement of steam rate, but its time of staying is oversize, and it is unbefitting that the evaporation of heat-sensitive substance is purified.

The purpose of this utility model provides a kind of higher boiling, heat-sensitive substance of being applicable to, has the evaporation treater of high steam rate.

The purpose of this utility model is achieved by following method.

On the evaporimeter heated wall, be welded with the spiral grooves of weir formula, the cross section of groove is V-shaped, its angle is 15～40 °, height of weir 20～60mm, on the evaporimeter heating wall from penetrating into down wire in the shape of a spiral, refining material passes through along spiral groove, realizes the evaporation purification operations of material, and concrete evaporation process is as follows:

After raw material liq is preheating to boiling temperature, add from the top notch, gradient by means of groove, material is dirty along helical, and under the heating of wall thermal source, partially liq is vaporized into gas, and overflow from the V-arrangement top of groove, the liquid of vaporization continue not dirty, until groove promptly finish evaporation process bottom, remaining raffinate is stayed at the bottom of the still.

The heating thermal source of still formula evaporation treater of the present utility model, available Far-infrared Heating, also available other suitable thermal source; Spiral grooves can be in the inwall or the outer wall welding of heated wall; Material stream can be that single channel also can be the multithread road; Vaporization chamber can be that single tube also can be a shell and tube.Below all can specifically set according to handled material situation.Still formula of the present utility model evaporation treater is specially adapted to that higher boiling, thermal sensitivity, viscosity are not high, good fluidity, needs high steam rate but the evaporation purification process that do not have crystallization to separate out.

Use efficient short distance still formula evaporation treater of the present utility model, have following effect:

1. equipment is simple and practical, only on the heating wall of general still formula evaporimeter, add weldering weir formula groove, and material liquid is flowed down along spiral grooves, the material that adds is promptly finished the vaporization evaporation process behind groove continuously, steam rate can reach 50～90%, even higher, the material evaporation time of staying is very short, and mean residence time has only 20～120 seconds.

2. owing to adopt material heating in the spiral grooves, liquid layer is very thin, has only 5～50mm, can not cause the elevation of boiling point of material again because of hydrostatic head.

The gas of 3. having vaporized in the evaporimeter is overflowed from " V " shape top immediately, and Liquid Flow is 60～90 ° of bifurcateds, can not cause the generation of foam.

Although 4. liquid level has height in the groove.But there is liquid to exist all the time,, reduced the hot polymerization loss so can not cause the dried wall fouling of heat-transfer area.

5. because flow section is " V " bathtub construction, increased heat transfer area, material liquid in flow process rotatablely moves as circumference simultaneously, has produced centrifugal force, has increased the disturbance and the Surface Renewal of liquid, and its result has strengthened diabatic process.

In sum, still formula evaporation treater of the present utility model is suitable for higher boiling, and the evaporation of thermal sensitivity organic matter and food industry material is purified, and is a kind of efficient short distance, calorific intensity height, the chemical unit evaporation equipment of the high steam rate of one way.

Accompanying drawing 1 is for using a kind of evaporation of still formula treater, wherein 1-evaporimeter of the present utility model; The 2-heating source; The 3-heated wall; The 4-guiding gutter; The 5-temperature tube; The 6-feed pipe; 7-boil-off gas riser; The 8-condenser.

Embodiment:

Adopt the φ 150 * 300mm still formula evaporation treater shown in the accompanying drawing 1, its guiding gutter angle is 30 °, height of weir 40mm.The material that will contain 95.3% N-phenylmaleimide (being called for short PMI) is added in the elevated dosing vessel, open vavuum pump, the regulating system absolute pressure is to 1333Pa, the adjusting charging rate is 3.5kg/h, after being preheating to 170～180 ℃, from elevated dosing vessel, join the evaporimeter continuously, under the evaporating temperature that the interior temperature of maintainer is 180 ℃, steam the PMI highly finished product continuously, Qi Hua raffinate is not stayed at the bottom of the still, the vapour phase that steams hot water condensation, lime set enters the insulation gatherer, add PMI crude product 15kg after, the lime set of collecting is poured out cooling curing, obtain content after the section and be 98.2% highly finished product 13.87kg, product yield is 98.8%.

Effect comparison sees Table

Evaporation treater type	Use Φ 150 * 300mm Fu formula evaporation treater of the present utility model	Plain edition 500 liter Fu formula evaporimeters
The material evaporation time of staying	0.3～5min	4～5h
Steam yield	98.8％	70％
Highly finished product quality colourity	Shallow	Deeply
Raffinate is removed	Easily	Form thick high polymer and remove difficulty

Claims

1. a still formula is evaporated treater, be provided with heating source in the still, heated wall, it is characterized in that being welded with on heated wall the spiral grooves of weir formula, the cross section of groove is " V ", and its angle is 15～40 °, height of weir 20～60mm, from penetrating into down, wire is made with extra care material and is passed through along spiral groove in the shape of a spiral on heating wall.