CN218166008U

CN218166008U - Rectification system is united to n-butyl acetate and ethyl acetate

Info

Publication number: CN218166008U
Application number: CN202222361695.9U
Authority: CN
Inventors: 王鹏; 佟刚; 邓宇雄; 赵楚榜
Original assignee: TAIXING JINJIANG CHEMICAL INDUSTRY CO LTD
Current assignee: TAIXING JINJIANG CHEMICAL INDUSTRY CO LTD
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2022-12-30
Anticipated expiration: 2032-09-06

Abstract

The utility model discloses a rectification system is united to n-butyl acetate and ethyl acetate, including first esterification kettle and esterification kettle, first esterification kettle, the second esterification kettle is connected respectively in first rectifying column, the second rectifying column, first rectifying column, the top of the tower of second rectifying column is respectively through first condenser, the second condenser is connected in first phase separator, the second phase separator, first phase separator, the second phase separator is connected in the heating tower, the heating tower is connected in the water pipe, first condenser, the coolant outlet of second condenser also is connected in the water pipe, the water pipe passes through the reboiler and then connects respectively in first rectification, the second rectifying column. The device collects the water phase generated in the esterification reaction process, removes less alcohol contained in the water phase by heating, heats the water phase into steam and enters the rectifying tower, and recycles the water phase; after the condensate water passes through the condenser, partial heat can be carried, and the condensate water enters the reboiler to form steam and enters the rectifying tower, so that the conversion energy efficiency is high.

Description

Rectification system is united to n-butyl acetate and ethyl acetate

Technical Field

The utility model relates to a n-butyl acetate and ethyl acetate production facility technical field, concretely relates to rectification system is united to n-butyl acetate and ethyl acetate.

Background

Ethyl acetate and n-butyl acetate are important organic solvents in chemical production, and are widely applied to industries such as paint, spice, textile and the like. Among the two preparation methods, the esterification method is one of the commonly used preparation methods, the two preparation methods are similar in production and preparation processes and only have partial difference in the aspect of preparation raw materials, the ethyl acetate preparation comprises esterification of acetic acid and ethanol under the catalysis of concentrated sulfuric acid, then rectification is carried out in an esterification tower, then gas phase condensation, layering and water phase collection are carried out, an oil phase enters further purification treatment, the n-butyl acetate preparation comprises esterification of n-butyl alcohol and acetic acid under the catalysis of concentrated sulfuric acid, then rectification is carried out in the esterification tower, then gas phase condensation, layering and water phase collection are carried out, an oil phase enters further purification treatment, both the preparation processes are carried out after rectification, layered water phases are collected, steam heating is required in the rectification process, and the condensation and the steam are carried out independently, so that the waste in the aspect of energy efficiency exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the not enough that exists among the above-mentioned background art, provide a rectification system is united to n-butyl acetate and ethyl acetate of practicing thrift the efficiency.

In order to achieve the above purpose, the utility model relates to a rectification system is united to n-butyl acetate and ethyl acetate has adopted following technical scheme:

the utility model provides a rectification system is united to n-butyl acetate and ethyl acetate, is including the first esterification cauldron that is used for acetic acid, ethanol to esterify and the second esterification cauldron that is used for acetic acid, n-butyl alcohol to esterify, first esterification cauldron, second esterification cauldron are connected respectively in first rectifying column, second rectifying column, and the top of the tower of first rectifying column, second rectifying column is connected in first phase separator, second phase separator through first condenser, second condenser respectively, first phase separator, second phase separator lower extreme are equipped with first liquid outlet, second liquid outlet, and first liquid outlet, second liquid outlet are connected in the heating tower, and the heating tower top is provided with the gas phase export, and the below is connected in the water pipe, and the cooling water export of first condenser, second condenser also is connected in the water pipe, and the water pipe passes through the reboiler subdividing and connects respectively in first rectification, second rectifying column.

The utility model relates to a rectification system is united to n-butyl acetate and ethyl acetate's further improvement part lies in, uses steam heat transfer in the heating tower, and steam still gets into the water heating of reboiler in to the water pipe.

Compared with the prior art, the beneficial effects of the utility model are that:

the device collects the water phase generated in the esterification reaction process, removes less alcohol contained in the water phase by heating, heats the water phase into steam and enters the rectifying tower, and recycles the water phase; after passing through the condenser, the condensed water carries part of heat and then enters the reboiler to form steam and enter the rectifying tower, so that the conversion efficiency is high; the same steam heating the water phase and heating in the reboiler also belongs to improving energy efficiency.

Drawings

Fig. 1 is a schematic structural view of the present invention;

in the figure: the device comprises a first esterification kettle 1, a second esterification kettle 2, a first rectifying tower 3, a second rectifying tower 4, a first condenser 5, a second condenser 6, a first phase separator 7, a second phase separator 8, a heating tower 9, a water pipe 10 and a reboiler 11.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, a rectification system is combined by n-butyl acetate and ethyl acetate, which comprises a first esterification kettle 1 for acetic acid and ethanol esterification and a second esterification kettle 2 for acetic acid and n-butyl alcohol esterification, wherein the first esterification kettle and the second esterification kettle are respectively connected to a first rectification tower 3 and a second rectification tower 4, the tops of the first rectification tower and the second rectification tower are respectively connected to a first phase separator 7 and a second phase separator 8 through a first condenser 5 and a second condenser 6, the bottoms of the first rectification tower and the second rectification tower are provided with liquid phase outlets, the lower ends of the first rectification tower and the second rectification tower are also provided with a heating gas phase inlet, the lower ends of the first phase separator and the second phase separator are provided with a first liquid outlet and a second liquid outlet, the first phase separator and the second phase separator are also provided with a liquid outlet connected to a subsequent purification step device, the first liquid outlet and the second heating tower 9 are connected to a gas phase outlet above the heating tower, the lower ends of the heating tower are connected to a water pipe 10, the cooling water outlet of the first condenser and the second phase cooler are also connected to a second rectification tower through a water pipe 11, and a reboiler. Further, heat is transferred in the heating tower by using steam, and the steam also enters a reboiler to heat water in the water pipe.

The utility model discloses a theory of operation does: acetic acid and ethanol are esterified and enter a first rectifying tower and are rectified by steam heating, ethyl acetate, water and partial alcohol exist in a gas phase, a water phase and an oil phase are obtained in a phase separator through condensation, the water phase contains a small amount of alcohol, the acetic acid and n-butyl alcohol are esterified and enter a second rectifying tower and are rectified by steam heating, n-butyl acetate, water and partial alcohol exist in the gas phase, the water phase and the oil phase are obtained in the phase separator through condensation, the water phase and the water phase contain a small amount of alcohol, the water phase and the water phase are collected in a heating tower, the alcohol is removed through heating, heated water is obtained and enters a reboiler, the water and cooling water discharged from a cooling water outlet of a condenser are heated into steam to enter the first rectifying tower and the second rectifying tower, water recycling is carried out, and the energy efficiency is improved.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A rectification system is united to n-butyl acetate and ethyl acetate, its characterized in that: including the first cauldron of esterifying that is used for acetic acid, ethanol to esterify and the second esterification cauldron that is used for acetic acid, n-butanol to esterify, first cauldron of esterifying, second esterification cauldron are connected respectively in first rectifying column, second rectifying column, and the top of the tower of first rectifying column, second rectifying column is connected in first phase separator, second phase separator through first condenser, second condenser respectively, first phase separator, second phase separator lower extreme are equipped with first liquid outlet, second liquid outlet, and first liquid outlet, second liquid outlet are connected in the heating tower, and the heating tower top is provided with the gas phase export, and the below is connected in the water pipe, and the cooling water export of first condenser, second condensate ware also connects in the water pipe, and the water pipe passes through the reboiler subdividing and connects respectively in first rectification, second rectifying column.

2. The combined rectification system of n-butyl acetate and ethyl acetate as set forth in claim 1, wherein: the heating tower uses steam to transfer heat, and the steam also enters a reboiler to heat the water in the water pipe.