CN221412505U - Acid methanol gas-liquid separation device in biodiesel production - Google Patents

Abstract

The utility model discloses an acidic methanol gas-liquid separation device in biodiesel production, which comprises: one end of a tangential feed inlet of the separator is connected with a feed enamel pipe, and the other end of the tangential feed inlet is tangentially arranged at the upper part of the separator cylinder; the top of the cylinder is connected with a separator cylinder flange cover, and the middle of the flange cover is provided with a separator gas phase outlet of which the inner sleeve is sleeved with a polytetrafluoroethylene sleeve; the upper end of the gas phase outlet is connected to the methanol distillation tower through a enamel pipe; a liquid phase outlet is arranged on a lower end socket of the separator at the lower end of the cylinder; the liquid phase outlet is provided with a tetrafluoroethylene-lined sight glass which is higher than the top of the esterification reaction kettle; the liquid phase discharging enamel pipe is connected with the pipe orifice of the esterification reaction kettle after being connected with the U-shaped bend; the cylinder body and each pipeline are made of carbon steel lining enamel, and the sealing surface of the flange is also made of enamel; the cylinder body is vertically installed and is fixed on a workshop steel frame through four hanging frames arranged on the cylinder body. The utility model has low manufacturing and maintenance cost, long service life and high yield, and solves the problem that the yield is affected by the easy corrosion of pipelines and entrained oil of acid methanol gas.

Description

Acid methanol gas-liquid separation device in biodiesel production

Technical Field

The utility model relates to the technical field of biodiesel production devices of organic chemical products, in particular to an acidic methanol gas-liquid separation device in biodiesel production.

Background

The biodiesel production generally adopts waste animal and vegetable oil as raw materials, and the reaction principle is that the waste animal and vegetable oil and an acid catalyst are introduced with methanol gas at the temperature of about 120 ℃ to carry out methyl esterification reaction in an enamel kettle (enamel tower) so as to convert fatty acid in the waste animal and vegetable oil into fatty acid methyl ester, namely biodiesel. The methyl esterification reaction is a reversible reaction, so that more fatty acid is converted into fatty acid methyl ester, excessive methanol gas is usually introduced in the production process, and water generated by the reaction is also removed continuously. The excess methanol gas is dissolved with water, oil and the like to form the acidic methanol gas with weak acidity except the consumption of the reaction. After the acid methanol gas with the oil is passed through a gas-liquid separation device, the gas-phase acid methanol gas is discharged from the top of the separator and enters a methanol distillation tower system for redistillation, and the methanol is recovered; and the oil at the bottom of the separator flows back into the methyl esterification kettle to continue the reaction, so that the outflow of the generated fatty acid methyl ester to a methanol distillation system is reduced.

Acid methanol gas from a methyl esterification reaction kettle in the prior art is generally conveyed by a stainless steel pipe, is separated by a stainless steel gas-liquid separator, and enters a methanol distillation tower for distillation to recover methanol; and the oil from the liquid phase at the bottom of the separator flows back into the esterification kettle. The defects are: because the acidic methanol gas has weak acidity and higher temperature, corrosion perforation of a stainless steel pipeline and a stainless steel gas-liquid separator is easy to cause, shutdown maintenance is needed, maintenance operations such as emptying, cleaning the pipeline, distilling tower, upper blind plate and the like are carried out, and not only the fire operation is very troublesome, but also the methyl esterification production is influenced.

Problems of the stainless steel gas-liquid separation device in the prior art are summarized as follows:

(1) Because the material temperature is higher and the material is acidic, the gas-liquid separation device made of stainless steel is not corrosion-resistant, and corrosion perforation often occurs;

(2) The acid methanol gas with oil is a flammable and explosive medium, if repair welding is needed, the operation of firstly stopping the machine, then carrying out the operations of emptying, cleaning and replacing, feeding a blind plate, detecting gas before firing and the like is tedious and has large workload;

(3) The equipment failure rate is high, and normal production is affected.

Disclosure of Invention

The utility model aims to provide an acidic methanol gas-liquid separation device in biodiesel production, which has the advantages of simple and compact structure, long service life, low maintenance cost and high yield, and solves the problems that the acidic methanol gas is easy to corrode pipelines and the entrained oil affects the yield in the prior art.

In order to achieve the aim, the acid methanol gas-liquid separation device in biodiesel production comprises a feeding enamel pipe 1, a separator tangential feed inlet 2, a separator cylinder 3, a separator lower seal head 4, a hanging rack 5, a separator cylinder flange 6, a separator cylinder flange cover 7, a separator gas phase outlet 8, a polytetrafluoroethylene sleeve 9, a gas phase discharge enamel pipe 10, a separator liquid phase outlet 11, a tetrafluoroethylene lining sight glass 12 and a liquid phase discharge enamel pipe 13; one end of a tangential feed inlet 2 of the separator is connected with a feed enamel pipe 1, and the other end of the tangential feed inlet is tangentially arranged at the upper part of a cylinder body 3 of the separator; the top of the separator cylinder 3 is connected with a separator cylinder flange cover 7 by adopting a flange, and a separator gas phase outlet 8 of an inner sleeve polytetrafluoroethylene sleeve 9 is arranged in the middle of the separator cylinder flange cover 7; the upper end of the gas phase outlet 8 of the separator is connected to a methanol distillation tower through a gas phase discharging enamel pipe 10; the lower end socket 4 of the separator connected with the lower end of the separator cylinder 3 is provided with a liquid phase outlet 11 of the separator; a tetrafluoroethylene-lined sight glass 12 is arranged behind the liquid phase outlet 11 of the separator, and is higher than the top of the esterification reaction kettle; the liquid phase discharging enamel pipe 13 is connected with the pipe orifice of the esterification reaction kettle after being bent in a U shape with the connecting height of not less than 1 meter; the separator cylinder 3 and each pipeline are made of carbon steel lining enamel, and the flange sealing surface is also made of enamel; the separator cylinder 3 is installed vertically and is fixed on a workshop steel frame through four hanging frames 5 arranged on the separator cylinder.

The polytetrafluoroethylene sleeve 9 has a thickness of 5mm, the flange of the sleeve is turned, the lower end of the sleeve is inserted into the separator cylinder 3, and the thickness of the sleeve is 50mm lower than the bottom of the tangential feed inlet 2 of the separator.

The acid methanol gas-liquid separation device in biodiesel production with the structure has the following technical characteristics and beneficial effects:

(1) The pipeline and the separator used in the utility model are both made of carbon steel lining enamel, the gasket material is polytetrafluoroethylene, and the corrosion resistance of the device is good.

(2) The gas phase outlet of the separator of the device adopts a polytetrafluoroethylene sleeve sleeved in an enamel pipe orifice, and the device has reasonable design, simple structure, easy manufacture and good corrosion resistance.

(3) The device has low manufacturing and maintenance cost and good separation effect, greatly improves the effective reaction time of the methyl esterification reaction kettle, and improves the esterification productivity.

(4) The device can be used in other similar medium occasions and has good universality.

Drawings

FIG. 1 is a schematic diagram of the structure of an acid methanol gas-liquid separation device in biodiesel production.

Reference numerals: the separator comprises a feeding enamel pipe 1, a separator tangential feed inlet 2, a separator cylinder 3, a separator lower seal head 4, a hanging frame 5, a separator cylinder flange 6, a separator cylinder flange cover 7, a separator gas phase outlet 8, a polytetrafluoroethylene sleeve 9, a gas phase discharging enamel pipe 10, a separator liquid phase outlet 11, a tetrafluoroethylene lining sight glass 12 and a liquid phase discharging enamel pipe 13.

Detailed Description

The acid methanol gas-liquid separation device in biodiesel production of the utility model is further described in detail below with reference to the accompanying drawings.

The utility model discloses an acidic methanol gas-liquid separation device in biodiesel production, which comprises a feed enamel pipe 1, a separator tangential feed inlet 2, a separator cylinder 3, a separator lower seal head 4, a hanger 5, a separator cylinder flange 6, a separator cylinder flange cover 7, a separator gas phase outlet 8, a polytetrafluoroethylene sleeve 9, a gas phase discharge enamel pipe 10, a separator liquid phase outlet 11, a tetrafluoroethylene lining sight glass 12 and a liquid phase discharge enamel pipe 13, wherein the gas phase outlet 8 is connected with the gas phase discharge enamel pipe 10; one end of a tangential feed inlet 2 of the separator is connected with a feed enamel pipe 1, and the other end of the tangential feed inlet is tangentially arranged at the upper part of a cylinder body 3 of the separator; the top of the separator cylinder 3 is connected with a separator cylinder flange cover 7 by adopting a flange, a separator gas phase outlet 8 of an inner sleeve polytetrafluoroethylene sleeve 9 is arranged in the middle of the separator cylinder flange cover 7, the thickness of the polytetrafluoroethylene sleeve 9 is 5mm, the sleeve flange is required to be turned over, and the lower end of the polytetrafluoroethylene sleeve 9 is required to be inserted into the separator cylinder 3 and is 50mm lower than the bottom of the tangential feed inlet 2 of the separator; the upper end of the gas phase outlet 8 of the separator is connected to a methanol distillation tower through a gas phase discharging enamel pipe 10; the lower end socket 4 of the separator connected with the lower end of the separator cylinder 3 is provided with a liquid phase outlet 11 of the separator; a tetrafluoroethylene-lined sight glass 12 is arranged behind the liquid phase outlet 11 of the separator so as to facilitate the observation of the discharging condition of the liquid in the separator, and the sight glass is higher than the top of the esterification reaction kettle; the liquid phase discharging enamel pipe 13 is connected with the pipe orifice of the esterification reaction kettle after being bent in a U shape with the connecting height of not less than 1 meter so as to play a role in liquid sealing; the separator cylinder 3 and each pipeline are made of carbon steel lining enamel, and the flange sealing surface is also made of enamel; the separator cylinder 3 is installed vertically and is fixed on a workshop steel frame through four hanging frames 5 arranged on the separator cylinder.

The specific operation steps of the acid methanol gas-liquid separation device in biodiesel production are as follows:

During production operation, acid methanol gas with oil from the methyl esterification reaction kettle enters the separator from the tangential feed inlet 2 of the separator through the feed enamel pipe 1 and rotates along the separator cylinder 3; the heavier liquid can be settled to the lower end enclosure 4 of the separator, and flows back to the methyl esterification reaction kettle from the liquid phase outlet 11 of the separator through the polytetrafluoroethylene lining sight glass 12 and the liquid phase discharging enamel pipe 13 for continuous reaction; the lighter acidic methanol gas enters a methanol distillation tower from a gas phase outlet 8 of the separator and a gas phase discharging enamel pipe 10 through a polytetrafluoroethylene sleeve 9 for distillation and recovery of methanol.

Claims (2)

1. An acidic methanol gas-liquid separation device in biodiesel production is characterized in that: the device comprises a feeding enamel pipe (1), a separator tangential feed inlet (2), a separator cylinder (3), a separator lower seal head (4), a hanging rack (5), a separator cylinder flange (6), a separator cylinder flange cover (7), a separator gas phase outlet (8), a polytetrafluoroethylene sleeve (9), a gas phase discharging enamel pipe (10), a separator liquid phase outlet (11), a tetrafluoroethylene lining sight glass (12) and a liquid phase discharging enamel pipe (13); one end of a tangential feed inlet (2) of the separator is connected with a feed enamel pipe (1), and the other end of the tangential feed inlet is tangentially arranged at the upper part of a cylinder body (3) of the separator; the top of the separator cylinder (3) is connected with a separator cylinder flange cover (7) by adopting a flange, and a separator gas phase outlet (8) of an inner sleeve polytetrafluoroethylene sleeve (9) is arranged in the middle of the separator cylinder flange cover (7); the upper end of the gas phase outlet (8) of the separator is connected to a methanol distillation tower through a gas phase discharging enamel pipe (10); a separator liquid phase outlet (11) is arranged on a separator lower seal head (4) connected with the lower end of the separator cylinder body (3); a tetrafluoroethylene-lined sight glass (12) is arranged behind the liquid phase outlet (11) of the separator, and the sight glass is higher than the top of the esterification reaction kettle; the liquid phase discharging enamel pipe (13) is connected with the pipe orifice of the esterification reaction kettle after being bent in a U-shaped way with the connecting height of not less than 1 meter; the separator cylinder body (3) and each pipeline are made of carbon steel lining enamel, and the flange sealing surface is also made of enamel; the separator cylinder body (3) is vertically installed and is fixed on a workshop steel frame through four hanging frames (5) arranged on the separator cylinder body.

2. The acid methanol gas-liquid separation device in biodiesel production according to claim 1, which is characterized in that: the polytetrafluoroethylene sleeve (9) has a thickness of 5mm, the flange of the sleeve is required to be turned, the lower end of the polytetrafluoroethylene sleeve is required to be inserted into the separator cylinder (3), and the polytetrafluoroethylene sleeve is 50mm lower than the bottom of the tangential feed inlet (2) of the separator.