CN202876402U

CN202876402U - Device for recovering methylsiloxane high cyclic body

Info

Publication number: CN202876402U
Application number: CN 201220480923
Authority: CN
Inventors: 李凯; 张勇; 温峻; 冯旭初
Original assignee: Zhejiang Hengyecheng Organic Silicon Co Ltd
Current assignee: Zhejiang Hengyecheng Organic Silicon Co Ltd
Priority date: 2012-09-20
Filing date: 2012-09-20
Publication date: 2013-04-17
Anticipated expiration: 2022-09-20

Abstract

The utility model discloses a device for recovering a methylsiloxane high cyclic body. The device comprises a dry-forcing kettle, a dry-forcing object condenser and a dry-forcing object storage tank, wherein the dry-forcing kettle is respectively connected with a middle pressure steam liquid inlet pipe and a middle pressure steam condensation liquid outlet pipe; the top of the dry-forcing kettle is connected with the dry-forcing object condenser by a pipeline; the dry-forcing object condenser is connected with the top of the dry-forcing object storage tank by a pipeline; and the dry-forcing object storage tank is also connected with a vacuum buffer tank by a pipeline. By adopting the device, the quality of a cracking and lightening product is obviously improved, the energy consumption in a production process is reduced, and the production cost is reduced.

Description

The high ring body retracting device of methylsiloxane

Technical field

The utility model relates to the high ring body retracting device of a kind of methylsiloxane.

Background technology

In original cracking technology, hydrolysate is periodically reaction in cracking still, and when reaction yield reduced, the cracking raffinate in the cracking still was regulated through Liquid level adjusting valve, control still liquid level under 80% condition, enter intermittence force force in the dried still dried.Force and do to adopt semicontinuous operation, early stage continuous feeding and discharging, the gas phase autothermic cracking tower bottom that steams enters in the cleavage column.Force dried still temperature then to be realized by TIC control conduction oil internal circulating load, keep 145 ° of C.Later stage stops charging, and intensification is forced dried, and the still temperature is no more than 220 ° of C.Force dried residue to be mainly silanol sylvite, water rushes to the deslagging tank.Its concrete device is: as shown in Figure 1, force dried still 1 ' to go out pipe 3 ' with conduction oil inlet pipe 2 ' and conduction oil respectively and link to each other, force dried still 1 ' top to link to each other with cracking still 4 ' by pipeline; Cracking still 4 ' links to each other with cleavage column 5 ' by pipeline, and cleavage column 5 ' top links to each other with cracking overhead condenser 6 ', and cracking overhead condenser 6 ' links to each other with cracking backflow pans 7 ' by pipeline; Cracking backflow pans 7 ' link to each other with vacuum buffer tank by pipeline.When adopting said apparatus to carry out the high ring body recovery of methylsiloxane, usually there is following several respects problem:

Problem 1: the high cyclosiloxane of higher boiling has strengthened the rectifying load of cleavage column back into cleavage column, has also shortened lytic cycle simultaneously.Because in original cracking technology, cracking still links to each other by the gas phase pipeline with cleavage column, the gas phase of forcing dried still to steam is carried out again rectifying at the bottom of getting back to cleavage column, but owing to major part in the cracking raffinate is the higher high cyclosiloxane of boiling point, after high cyclosiloxane at high temperature gasifies, at the bottom of getting back to tower from the gas phase pipeline, along with reducing step by step of cleavage column temperature, and be condensed into the liquid tower reactor that flows into, take away a large amount of heat energy, affect the control of tower temperature, thereby increased the rectifying load of cleavage column.Because high polymer originally belongs to the material of difficult cracking in the cracking reaction, in forcing the process of doing, get back to fast in the cracking still simultaneously, shortened the cycle of cracking reaction.

Problem 2: use heat-conducting oil heating to force dried still, consume a large amount of electric energy.In order to keep the normal operation of cleavage column, force dried still must keep steaming temperature constant, thereby the column bottom temperature of keeping cleavage column is constant, the heat-conducting oil system heating is a kind of reasonable heated at constant temperature mode, but conduction oil is when opening, being heated to the arts demand temperature from normal temperature needs the regular hour, so in normal production, can consume a large amount of electric energy aspect the preheating of conduction oil.

The utility model content

The purpose of this utility model is to provide a kind of methylsiloxane high ring body retracting device, and the utility model has significantly improved cracking and put forward the light product quality, has reduced energy consumption in the production technology, has saved production cost.

In order to achieve the above object, the technical solution of the utility model is:

The high ring body retracting device of a kind of methylsiloxane comprises and forces dried still, forces the dry condenser, forces the dry storage tank; Wherein saidly force dried still to link to each other with the medium-pressure steam condensate drain pipe with the middle pressure steam air inlet pipe respectively; The described dried still still top of forcing links to each other with forcing the dry condenser by pipeline; The described dry condenser of forcing links to each other with forcing the dry tank top by pipeline; The described dry storage tank of forcing also links to each other with vacuum buffer tank by pipeline.

The beneficial effects of the utility model are: the utility model has removed forces the gas phase pipeline of dried still at the bottom of the cleavage column in original technique, increase a condenser and forced the dry storage tank, make the vapour phase of forcing dried still the to steam device condensation that is condensed, the fluid storage of condensation is in forcing the dry storage tank.Secondly the utility model utilizes middle pressure steam to substitute the heat-conducting oil system heating, along with the improvement of forcing dried still technique, forces the temperature when doing also not have original requirement harsh, so the heating efficiency of middle pressure steam just can satisfy the manufacturing technique requirent of forcing dried still.Present operating procedure condition, cracking still discharge cracking raffinate intermittently is to forcing in the dried still, and cracking still continues charging and drives to produce behind the discharge, force dried still to vacuumize after, temperature is then realized by TIC control steam flow, keeps 150-180 ℃.Force and did two days, force dried residue to be mainly silanol sylvite, water rushes to the deslagging tank.Improve the purpose that cracking is put forward light product quality and reduced the energy consumption in the technique thereby reached.Force the dry of forcing that reclaims in the dry storage tank, again carry out cracking after being delivered to the hydrolysate storage tank and hydrolysate mixes with pump.

This shows that the utility model has significantly improved cracking and put forward the light product quality, has reduced energy consumption in the production technology, has saved production cost.

Description of drawings

Fig. 1 is the traditional high ring body retracting device of methylsiloxane structural representation.

Fig. 2 is structural representation of the present utility model.

The specific embodiment

As shown in Figure 2, the high ring body retracting device of a kind of methylsiloxane of present embodiment comprises and forces dried still 1, forces dry condenser 2, forces dry storage tank 3; Wherein saidly force dried still 1 to link to each other with medium-pressure steam condensate drain pipe 5 with middle pressure steam air inlet pipe 4 respectively; The described dried still 1 still top of forcing links to each other with forcing dry condenser 2 by pipeline; The described dry condenser 2 of forcing links to each other with forcing dry storage tank 3 tops by pipeline; The described dry storage tank 3 of forcing also links to each other with vacuum system by pipeline.

Cracking still discharge residue enters through pipeline forces dried still 1, by forcing dry storage tank 3 to vacuumize by pipeline, force dried still 1 to heat by middle pressure steam, 150-180 ℃ of temperature control, force do vapor-phase material by pipeline after forcing dry condenser 2 cooling, be recycled to through pipeline and force in the dry storage tank 3, after the cycle of operation finishes, to force material discharge in the dry storage tank 3, again carry out cracking after being delivered to the hydrolysate storage tank and hydrolysate mixes with pump.

Through improvement of the present utility model, the quality of lysate has had large increase, and table 1 is the main product D3(hexamethyl cyclotrisiloxane of water-splitting), the D4(octamethylcy-clotetrasiloxane), the D5(decamethylcyclopentaandoxane) content.Contrast by table 1 can find out that the content of major product is significantly increased in the lysate that the explained hereafter of present embodiment goes out.The cracking reaction cycle also increases simultaneously, and about 72 hours of general cracking production cycle of technique originally, the existing technique cracking production cycle is about 100 hours.

Significant effect is also arranged, although interpolation equipment needs about 50,000 yuan of consumption fund in the saving of the energy.But originally in the production technology, the power of hotline heater is 72kw/h, forces dried still to move per month 15 days, power consumption in a year 31.1 ten thousand kw, and commercial power is 1.3 yuan/kw.Consume about 400,000, add equipment depreciation and maintenance cost about 420,000/year.After using middle pressure steam instead, force dried still operation to consume per month 10 tons of middle pressure steams, 220 yuan/tons of steam, a year consumption steam expense is 2.6 ten thousand yuan.

This shows that present embodiment has significantly improved cracking and put forward the light product quality, has reduced energy consumption in the production technology, has saved production cost.

Table 1

?	D3 content/%	D4 content/%	D5 content/%
				Former water-splitting production technology	6%	72%	22%

[0019]?

Existing cracking production technology

8%

78%

14%

Claims

1. the high ring body retracting device of methylsiloxane is characterized in that: comprise and force dried still (1), force dry condenser (2), force dry storage tank (3); The wherein said dried still (1) of forcing links to each other with medium-pressure steam condensate drain pipe (5) with middle pressure steam air inlet pipe (4) respectively; Described dried still (1) the still top of forcing links to each other with forcing dry condenser (2) by pipeline; The described dry condenser (2) of forcing links to each other with forcing dry storage tank (3) top by pipeline; The described dry storage tank (3) of forcing also links to each other with vacuum system by pipeline.