CN111729635A

CN111729635A - Energy-saving DOTP apparatus for producing

Info

Publication number: CN111729635A
Application number: CN202010632484.7A
Authority: CN
Inventors: 魏乐钊; 王美霞; 张志鹏; 张克; 张先鹏
Original assignee: Shandong Langhui Grand Pacific Petrochemical Co
Current assignee: Shandong Langhui Grand Pacific Petrochemical Co
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2020-10-02

Abstract

The invention discloses an energy-saving DOTP production device, which comprises an esterification kettle, wherein the upper surface of the esterification kettle is movably connected with a stirring motor, the lower surface of the stirring motor is movably connected with a stirring shaft, the outer surface of the stirring shaft is fixedly connected with stirring blades, the bottom of the stirring shaft is fixedly connected with a stirring ring, and the bottom of the esterification kettle is movably connected with a bottom cover. This energy-saving DOTP apparatus for producing, through the connecting pipe, feeding bottle A, feeding bottle, the downcomer, the heating bottle, the electric heat piece, mutually support between scale mark and the valve, the higher authority increased, temperature sensor has been set up through the upper surface at the cauldron of esterifying, temperature through observing temperature sensor, when the cauldron of esterifying heaies up to 190 ℃, with octanol through the inside high-pressure lime set heating back at, through adjusting the speed that octanol descends, add the little flow benefit of octanol in the cauldron of esterifying, the rise time has been improved, steam consumption has been reduced, the device output has been improved.

Description

Energy-saving DOTP apparatus for producing

Technical Field

The invention relates to the technical field of DOTP production, in particular to an energy-saving DOTP production device.

Background

The esterification process of plasticizer DOTP is a reaction-rectification coupled process, terephthalic anhydride and octanol are subjected to esterification reaction under the action of a catalyst (commonly used titanium catalyst such as TPT), the first step of reaction is heterogeneous reaction, the second step of reaction is homogeneous reaction, water generated by the reaction and excessive octanol form an alcohol-water azeotrope, octanol steam and the alcohol-water azeotrope enter a filling tower and a condenser above a reaction tank for separation, dehydration and octanol recovery, the heat required in the esterification process mainly comprises three parts of heat required by material temperature rise, reaction heat and heat required by mass material evaporation in a system, wherein most of the heat is used for evaporating material-octanol, but excessive evaporation of octanol not only can reduce the temperature of the reaction tank, but also can reduce the concentration of alcohol in the reaction system, so that proper reaction conditions have important practical significance for improving the reaction speed and reducing the energy consumption of the DOTP esterification reaction, at present, in the batch-type industrial production process of DOTP, because the mass transfer and heat transfer in the esterification process are limited, water generated in the reaction cannot be removed in time and other adverse factors influence, the conversion rate in the esterification process is reduced, the reaction speed is slow, the batch production time of products is long, the improvement of the production efficiency and the reduction of the unit manufacturing cost are not facilitated, so that the production equipment has the need of further improvement, the DOTP production device is originally designed to add reaction alcohol, excessive alcohol and PTA into a reaction kettle for reaction, and the investment of a large amount of low-temperature alcohol not only prolongs the temperature rise time, but also increases the steam consumption.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides an energy-saving DOTP production device, which has the advantages of reducing the temperature rise time, reducing the steam consumption and the like, and solves the problems of long temperature rise time and high steam consumption.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an energy-saving DOTP apparatus for producing, is including esterifying the cauldron, the upper surface swing joint of the cauldron of esterifying has agitator motor, agitator motor's lower surface swing joint has the (mixing) shaft, the outer fixed surface of (mixing) shaft is connected with stirring vane, the bottom fixedly connected with stirring ring of (mixing) shaft, the bottom swing joint of the cauldron of esterifying has the bottom, the upper surface swing joint of the cauldron of esterifying has the inlet pipe, the surface of inlet pipe has feeding bottle A and feeding bottle B through connecting pipe swing joint, feeding bottle A's upper surface has the bottle that heats through downcomer swing joint.

Preferably, a temperature sensor is arranged on the upper surface of the esterification kettle.

Preferably, the outer surface of the esterification kettle is movably connected with a support frame through a support block.

Preferably, an electric heating piece is arranged inside the heating bottle.

Preferably, the bottom of the stirring ring is movably connected with the bottom of the esterification kettle.

Preferably, the upper surface of the esterification kettle is provided with a feed inlet, and the feed inlet is movably connected with a feed pipe.

Preferably, the bottom cover is of a detachable structure, and the bottom of the esterification kettle is trapezoidal.

Preferably, the outer surfaces of the heating bottle, the feeding bottle A and the feeding bottle B are provided with scale marks.

Preferably, the outer surfaces of the sewer pipe and the connecting pipe are provided with valves.

(III) advantageous effects

Compared with the prior art, the invention provides an energy-saving DOTP production device, which has the following beneficial effects:

this energy-saving DOTP apparatus for producing, through the connecting pipe, feeding bottle A, feeding bottle, the downcomer, the heating bottle, the electric heat piece, mutually support between scale mark and the valve, the higher authority has increased, through set up temperature sensor at the upper surface of esterification kettle, can be through observing temperature sensor's temperature, when the esterification kettle heaies up to 190 ℃, with the inside high-pressure lime set heating back of octanol through at, through adjusting the speed that the octanol descends, add the little flow benefit of octanol into the esterification kettle, the heat-up time has been improved, steam consumption has been reduced, the device output has been improved, the secondary is mended the reflection cycle after the alcohol is put into use and is shortened to the hour, simultaneously each combustion cost reduces to some extent, through set up the (mixing) shaft in the inside of esterification kettle, stirring vane, stirring ring and bottom, the mixing rate of inside liquid can be accelerated, reduce the production of sediment.

Drawings

FIG. 1 is a schematic structural diagram of an energy-saving DOTP production apparatus according to the present invention;

FIG. 2 is a schematic structural view of a stirring blade of the energy-saving DOTP production apparatus provided by the present invention.

In the figure: 1. an esterification kettle; 2. a stirring motor; 3. a stirring shaft; 4. a stirring blade; 5. a stirring ring; 6. a bottom cover; 7. a feed pipe; 8. a connecting pipe; 9. a feeding bottle A; 10. a feeding bottle B; 11. a sewer pipe; 12. heating the bottle; 13. a temperature sensor; 14. a support block; 15. a support frame; 16. an electric heating sheet; 17. a feed inlet; 18. scale lines; 19. and (4) a valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, an energy-saving DOTP production device comprises an esterification kettle 1, wherein the upper surface of the esterification kettle 1 is movably connected with a feeding pipe 7, the outer surface of the feeding pipe 7 is movably connected with a feeding bottle a9 and a feeding bottle B10 through a connecting pipe 8, the upper surface of a feeding bottle a9 is movably connected with a heating bottle 12 through a sewer pipe 11, an electric heating sheet 16 is arranged inside the heating bottle 12, the outer surfaces of the heating bottle 12, the feeding bottle a9 and the feeding bottle B10 are provided with scale marks 18, valves 19 are arranged on the outer surfaces of the sewer pipe 11 and the connecting pipe 8, a temperature sensor 13 is arranged on the upper surface of the esterification kettle 1 through the mutual matching among the connecting pipe 8, the feeding bottle a9, the feeding bottle 10, the sewer pipe 11, the heating bottle 12, the electric heating sheet 16, the scale marks 18 and the

valve

19, 12 is additionally arranged on, by observing the temperature of the temperature sensor 13, when the esterification kettle 1 is heated to 190 ℃, octanol is heated through 16 high-pressure condensate in the esterification kettle 12, the speed of the falling of the octanol is adjusted through 19, the small-flow octanol is supplemented into the esterification kettle 1, the heating time is prolonged, the steam consumption is reduced, the yield of the device is improved, the reaction period is shortened to 8 hours after secondary alcohol supplementation, and the combustion cost is reduced;

esterification kettle 1's upper surface swing joint has agitator motor 2, agitator motor 2's lower surface swing joint has (mixing) shaft 3, agitator shaft 3's surface fixedly connected with stirring vane 4, agitator shaft 3's bottom fixedly connected with stirring ring 5, esterification kettle 1's bottom swing joint has bottom 6, esterification kettle 1's surface has support frame 15 through supporting shoe 14 swing joint, stirring ring 5's bottom swing joint is in esterification kettle 5's bottom, esterification kettle 1's upper surface is provided with feed inlet 17, feed inlet 17's inside swing joint has inlet pipe 7, bottom 6 is for dismantling the structure, esterification kettle 1's bottom is trapezoidal, through set up (mixing) shaft 3 in esterification kettle 1's inside, stirring vane 4, stirring ring 5 and bottom 6, the mixing speed of inside liquid can accelerate, reduce the production of sediment.

In summary, when the energy-saving DOTP production device is used, through the mutual matching among the connecting pipe 8, the feeding bottle A9, the feeding bottle 10, the sewer pipe 11, the heating bottle 12, the electric heating sheet 16, the scale mark 18 and the

valve

19, 12 is added on the upper surface 9, through arranging the temperature sensor 13 on the upper surface of the esterification kettle 1, the octanol can be heated through the high-pressure condensate liquid 16 in the esterification kettle 12 when the temperature of the esterification kettle 1 is raised to 190 ℃, the descending speed of the octanol is adjusted through 19, the small flow of the octanol is supplemented into the esterification kettle 1, the temperature raising time is improved, the steam consumption is reduced, the yield of the device is improved, the reaction period is shortened to 8 hours after the secondary alcohol supplementation, simultaneously, the combustion cost is reduced, through arranging the stirring shaft 3, the stirring blades 4, the stirring ring 5 and the bottom cover 6 in the esterification kettle 1, the mixing speed of the internal liquid can be accelerated, and the generation of sediment is reduced.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an energy-saving DOTP apparatus for producing, includes esterification kettle (1), its characterized in that: the upper surface swing joint of reation kettle (1) has agitator motor (2), the lower surface swing joint of agitator motor (2) has (mixing) shaft (3), the outer fixed surface of (mixing) shaft (3) is connected with stirring vane (4), the bottom fixedly connected with stirring ring (5) of (mixing) shaft (3), the bottom swing joint of esterification kettle (1) has bottom (6), the upper surface swing joint of esterification kettle (1) has inlet pipe (7), the surface of inlet pipe (7) has feeding bottle A (9) and feeding bottle B (10) through connecting pipe (8) swing joint, the upper surface of feeding bottle A (9) has heating bottle (12) through downcomer (11) swing joint.

2. The energy-saving DOTP production device of claim 1, wherein: and a temperature sensor (13) is arranged on the upper surface of the esterification kettle (1).

3. The energy-saving DOTP production device of claim 1, wherein: the outer surface of the esterification kettle (1) is movably connected with a support frame (15) through a support block (14).

4. The energy-saving DOTP production device of claim 1, wherein: an electric heating piece (16) is arranged in the heating bottle (12).

5. The energy-saving DOTP production device of claim 1, wherein: the bottom of the stirring ring (5) is movably connected with the bottom of the esterification kettle (5).

6. The energy-saving DOTP production device of claim 1, wherein: the upper surface of esterification kettle (1) is provided with feed inlet (17), the inside swing joint of feed inlet (17) has inlet pipe (7).

7. The energy-saving DOTP production device of claim 1, wherein: the bottom cover (6) is of a detachable structure, and the bottom of the esterification kettle (1) is trapezoidal.

8. The energy-saving DOTP production device of claim 1, wherein: the outer surfaces of the heating bottle (12), the feeding bottle A (9) and the feeding bottle B (10) are provided with scale marks (18).

9. The energy-saving DOTP production device of claim 1, wherein: the outer surfaces of the sewer pipe (11) and the connecting pipe (8) are both provided with valves (19).