CN103980393A

CN103980393A - Spray drying method in chlorinated polypropylene production

Info

Publication number: CN103980393A
Application number: CN201410146848.5A
Authority: CN
Inventors: 项东升
Original assignee: Yancheng Vocational Institute of Industry Technology
Current assignee: Yancheng Institute of Industry Technology; Yancheng Vocational Institute of Industry Technology
Priority date: 2014-04-11
Filing date: 2014-04-11
Publication date: 2014-08-13

Abstract

A spray drying method in chlorinated polypropylene production relates to a chlorinated polypropylene production method. The technical process is as follows: 1, a chlorinated fluid paste semi-finished product is heated to a high temperature, and is sent into a spray drying tower by a feed pump at a constant speed for spray drying under vacuum conditions; 2, under the high temperature and vacuum conditions, chloroform in chlorinated polypropylene is rapidly vaporized, and enters into a condenser for recovery; and 3, a gas-powder separated chlorinated polypropylene product is cooled to room temperature to collect as a finished product. The prominent advantages are that: by the spray drying method, cumbersome procedures of solvent recovering with hot water, grinding and drying with a fluid bed dryer of an original production process can be eliminated, the defects of long production cycle, higher energy consumption, large wastewater quantity, high solvent consumption and the like of the original production process can be overcome, and the new process is simple and high in semi automation degree, shortens the production cycle, is free of waste water, low in energy consumption, high in product density, and easy in transportation, reduces the cost of production, and has considerable economic and social benefits.

Description

A kind of spray-drying process method in Chlorinated Polypropylene III production

Technical field

The present invention relates to the production method of Chlorinated Polypropylene III, particularly a kind of spray-drying process method in Chlorinated Polypropylene III production.

Background technology

1, Chlorinated Polypropylene III is the polypropylene chemical modification thing that contains cl radical in a kind of structure, be called for short CPP, for white or light yellow solid is Powdered or granulated product, have nontoxic, acidproof, water-fast, the transparency is good, easily film forming, the feature such as nonflammable, due to the reason of its molecular structure and molecular polarity, its sticking power, cementability, the performances such as compatibility etc. are all good than polypropylene, can meet many-sided needs, can be used for coating, tackiness agent, the field such as ink carrier and leather treatment, according to the difference of chlorination degree, Chlorinated Polypropylene III can be divided into high Chlorinated Polypropylene III (chlorination degree 62-67%) and the large series products of low Chlorinated Polypropylene III (chlorination degree 20-40%) two.

Chlorinated Polypropylene III (CPP), because of excellent property, is widely used, and has obtained abroad tremendous development.Along with the industry requirement class such as printing, plastic wrapping improve constantly, add the development of senior ink, tackiness agent and coating, domestic market will sharply increase the demand of CPP, particularly ink industry requirement amount speedup maximum.

2, CPP is made through chlorination reaction by polypropylene, and production method mainly contains chlorination by solid state method, chloride solution (taking tetracol phenixin as solvent) and half aqueous suspension chlorination method.

Chlorination by solid state method technique is simple, and equipment corrosion is little, and product purity is high, and production cost is low, no waste discharge, but it belongs to inhomogeneous reaction, and chlorination is inhomogeneous, and reaction heat is removed difficulty, and easily coking, variable color and bonding, therefore seldom adopt in industrial production.Chloride solution is one of the most frequently used method of current industrial production CPP, and feature is that chlorination is more even, and reaction is controlled than being easier to, and product cl content generally can reach 53%-63%, can meet the requirement of the industry such as coating, tackiness agent practical application.Weak point is that in production process, solvent loss amount is large, and production cost is high, has remaining solvent in product, of low quality, and in production process, environmental pollution is serious.Due to the signing of Montreal Protocol on Substances that Deplete the Ozone Layer, developed country's nineteen ninety-five has been closed many carbon tetrachloride method CPP production equipments.

Within 2000, rise, domestic Chlorinated Polypropylene III enterprise, by adopting non-ODS new production process, transforms original CTC solvent method production technique, then adopts half aqueous suspension chlorination method to produce.Half aqueous suspension chlorination method is produced CPP, is production chlorination polypropylene Technology advanced person in the mixed solvent of chloroform and water, qualified product and containing ODS residue.Reach in superseded CTC consumption, can retain the production of Chlorinated Polypropylene III, to meet enterprise's self-growth requirement and domestic market needs.

3, half aqueous suspension chlorination method is produced CPP solvent recuperation and finished product drying method.Method for recovering solvents is the difference of utilizing between chloroform boiling point and water boiling point, 95 DEG C of hot water are made desolvation medium and reclaim solvent, obtain the cotton-shaped product of CPP simultaneously, then wash, pulverize and to obtain CPP powder-product, again with the dry 24h of heated dry air, make its water ratio from 65% is down to 0.8%, could use ketone, benzene kind solvent to dissolve, energy consumption for drying accounts for 20% left and right of its production cost.

Summary of the invention

The present invention is intended to the deficiency for above-mentioned half aqueous suspension chlorination method solvent recuperation and finished product drying method, spray drying process in a kind of Chlorinated Polypropylene III production is provided, cancel original production process Recovery of the hot water solvent, pulverizing and Fluidized-bed dryer and dried complicated procedures, overcome the original production process production cycle long, the defects such as energy consumption is high, wastewater flow rate is many, solvent loss is large, novel process is simple, level of automation is high, shortened the production cycle, without waste water, energy consumption is low, product density is high, easily transport, has reduced production cost, and economic and social benefit is considerable.

In order to achieve the above object, the present invention adopts following technical scheme:

Spray-drying process method in a kind of Chlorinated Polypropylene III production of the present invention, its technical process is:

1. the stream shape lotion work in-process after chlorination are heated to high temperature, are at the uniform velocity sent in spray-drying tower atomization drying under vacuum state by fresh feed pump;

2. under high temperature and vacuum state, the chloroform in Chlorinated Polypropylene III is vaporized rapidly, enter condenser and reclaim;

3. the Chlorinated Polypropylene III product after gas powder being separated, is cooled to room temperature and is collected as finished product.

Chlorinated Polypropylene III of the present invention produce in solvent recuperation and finished product drying method compared with the existing technology have advantages of outstanding: one, in spray-drying process method, whole technological process all completes in airtight vacuum system, can greatly reduce the volatilization of chloroform in emptying and the loss of dissolving in water; Two, in this technique, under vacuum state, take off back chloroform, without Recovery of the hot water, can reclaim to greatest extent chloroform, reduce the environmental pollution causing because of emptying a small amount of chloroform volatilization and discharge of wastewater; Three, in this technique, be dried for a long time the high CPP powder of water ratio without heated dry air, energy consumption is low, shortens the production cycle, has saved production cost; Four, in this technique, product is higher than powder-product density in former technique, and volume is little, reduces transportation cost, economic benefits; Five, semi-automatic technique, reduces labor strength.

Figure of description

Fig. 1 is spray process schema of the present invention.

Fig. 2 is that half aqueous suspension chlorination method reclaims drying technology process figure.

Embodiment

Introduce the embodiment of spray-drying process method in a kind of Chlorinated Polypropylene III production of the present invention below:

Chlorinated Polypropylene III of the present invention produce in spray-drying process method, its technical process is:

Above-mentioned technique 1. in, the cl content that obtains by polypropylene after chlorination is that 25-65%, Chlorinated Polypropylene III content are that the chlorated liquid of 23%-28% (mass percent) is heated to high temperature through flash pipe, at the uniform velocity sends in spray-drying tower atomization drying under vacuum state through fresh feed pump.

Above-mentioned technique 1., 2. in, be sprayed into tower feed temperature and be controlled at 130 ± 2 DEG C.

Above-mentioned technique 1., 2. in, vacuum tightness-0.1MPa～-0.0.08MPa.

Above-mentioned technique 2. in, the chloroform of vaporizing is discharged from tower top, enter condenser reclaim, enter chloroform storage tank.

Above-mentioned technique 3. in, to gas powder separate after tower in be blown into again nitrogen, blow chloroform, discharging, Chlorinated Polypropylene III is cooled to room temperature and is collected as finished product

In actual production, the major equipment in technique of the present invention comprises flash distillation heating tube, fresh feed pump, spray-drying tower, water recirculator, vacuum unit, vacuum buffer cylinder and chloroform storage tank.

Claims

1. a spray-drying process method in Chlorinated Polypropylene III production, is characterized in that, this technical process is:

1. the stream shape lotion work in-process after chlorination are heated to high temperature, are at the uniform velocity sent in spray-drying tower by fresh feed pump, atomization drying under vacuum state, takes off back chloroform;

2. the production method of preparing Chlorinated Polypropylene III according to described a kind of spray-drying process of claim 1, is characterized in that: above-mentioned technique 1. in, be heated to 130 ± 2 DEG C through flash pipe convection current shape lotion work in-process.

3. the production method of preparing Chlorinated Polypropylene III according to described a kind of spray-drying process of claim 1, is characterized in that: the vacuum tightness-0.1MPa～-0.0.08MPa of above-mentioned technique in 2..

4. the production method of preparing Chlorinated Polypropylene III according to described a kind of spray-drying process of claim 1, is characterized in that: the Chlorinated Polypropylene III product after the gas powder of above-mentioned technique in 3. separates, adopts the method for air cooling.

5. the production method of preparing Chlorinated Polypropylene III according to described a kind of spray-drying process of claim 1, is characterized in that: the major equipment in technique of the present invention comprises flash distillation heating tube, spray-drying tower, water recirculator, vacuum unit, vacuum buffer cylinder and chloroform storage tank.