Filtered tail gas recovery device in alkyd resin production

Abstract

A feed valve, a tail gas outlet valve and a filter circulating valve are arranged at the top of a stirring tank, the upper side surface of the stirring tank is connected with the upper part of a filter through a filter overflow valve pipeline, and a bottom outlet of the stirring tank is connected with the bottom of the filter after being connected with a feed pump; a filter discharge pipe is divided into two paths, one path is connected with the receiving tank through a discharge valve, and the other path is connected with a filter circulating valve; a discharge pipe of the receiving tank is connected with a finished product storage tank after being connected with a discharge pump; a tail gas pipeline with a tail gas outlet valve at the upper part of the receiving tank is connected with a gas inlet of a spiral plate heat exchanger after being converged with a tail gas pipeline with a stirring tank tail gas outlet valve; the upper gas outlet of the heat exchanger is connected with a gas buffer tank after being connected with an induced draft fan, a cooling water outlet valve is arranged on the upper side, and a cooling water inlet valve is arranged on the lower side; a lower outlet pipeline is connected with a buffer tank bottom valve, then is converged with a discharge pipeline of the heat exchanger and then is connected with a solvent recovery tank, and a discharge valve is arranged at the bottom of the gas buffer tank. The device is pollution-free in production, energy-saving and consumption-reducing.

Description

Technical Field

[0001] The utility model relates to the technical field of an auxiliary production device for an organic chemical product alkyd resin, in particular to a filtering tail gas recovery device in the production of alkyd resin. Background Art

[0002] The raw materials for synthesizing alkyd resin include soybean oil, glycerin, benzoic acid, terephthalic acid, and a heavy aromatic hydrocarbon diluent. All raw materials, except the heavy aromatic hydrocarbon diluent, are placed in a reactor and heated to a high temperature. A high-molecular-weight alkyd resin is synthesized through transesterification and esterification reactions (reversible reactions) at high temperatures, and the generated water is discharged. After the reaction, the temperature is lowered to 160°C, and the heavy aromatic hydrocarbon diluent is added to the reactor to dilute the alkyd resin into a flowable semi-finished product at a high temperature of around 120°C. The finished resin is then filtered to remove impurities. High-temperature filtration produces solvent tail gas, which, if not recovered, not only pollutes the environment but also wastes energy. Summary of the Invention

[0003] The utility model aims to provide a filtering tail gas recovery device for alkyd resin production which is pollution-free, energy-saving and consumption-reducing, simple in structure, easy to operate and reliable in use.

[0004] In order to achieve the above purpose, the filtering tail gas recovery device in the production of alkyd resin of the present invention includes a stirring tank 1, a filter 2, a receiving tank 3, a spiral plate heat exchanger 4, a solvent recovery tank 5, an induced draft fan 6, and a gas buffer tank 7; the top of the stirring tank 1 is provided with a stirring tank feed valve 1-1, a stirring tank tail gas outlet valve 1-2 and a filter circulation valve 1-3, the upper side of the stirring tank 1 is connected to the upper part of the filter 2 through a filter overflow valve 2-1 pipeline, and the bottom outlet of the stirring tank 1 is connected to the bottom of the filter 2 after connecting to the stirring tank feed pump 1-4; the discharge pipe on the lower side of the filter 2 is divided into two routes, one route is connected to the receiving tank 3 through the filter discharge valve 2-2, and the other route is connected to the filter circulation valve 1-3; the bottom of the receiving tank 3 The discharge pipe is connected to the finished product storage tank after being connected to the receiving tank discharge pump 3-2. The exhaust pipe with the receiving tank exhaust gas outlet valve 3-1 located on the upper part of the receiving tank 3 is connected to the side air inlet of the spiral plate heat exchanger 4 after merging with the exhaust pipe with the stirring tank exhaust gas outlet valve 1-2; the upper air outlet of the spiral plate heat exchanger 4 is connected to the gas buffer tank 7 after being connected to the induced draft fan 6, and a cooling water outlet valve 4-1 is provided on the upper side, and a cooling water inlet valve 4-2 is provided on the lower side; the gas buffer tank 7 is connected to the flame arrester 7-1 at the top, and the lower outlet pipe is merged with the bottom discharge pipe of the spiral plate heat exchanger 4 after being connected to the buffer tank bottom valve 7-2, and then connected to the top of the solvent recovery tank 5, and a solvent recovery tank discharge valve 5-1 is provided at the bottom of the solvent recovery tank 5.

[0005] Openings are provided at the top of the alkyd resin finished product receiving tank and the mixing tank, and the solvent tail gas in the receiving tank and the mixing tank is filtered through pipes and induced draft fans; a spiral heat exchanger is installed at the front end of the induced draft fan, and a buffer tank is installed at the rear end. During the filtration process, the induced draft fan is turned on to lead the solvent tail gas in the receiving tank and the mixing tank into the spiral heat exchanger for heat exchange, and the solvent tail gas is cooled into liquid and then enters the buffer tank for recycling and reuse.

[0006] The above-mentioned filtration tail gas recovery device in the production of alkyd resin has the following technical features and

[0007] Beneficial effects:

[0008] 1. The volatilized solvent in the filtration process can be recycled and reused. Each plate filtration can recycle 5‰ of the solvent, reducing production costs.

[0009] 2. During filtration, the exhaust gas is led to the spiral heat exchanger for heat exchange, which has a good energy-saving effect.

[0010] 3. Through waste gas recovery, the solvent volatilized during the filtration process is not discharged into the atmosphere, achieving an environmental protection effect.

[0011] 4. Simple structure, easy operation and reliable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the main structure of the filtering tail gas recovery device used in the production of alkyd resin.

[0013] Reference numerals: stirring tank 1, stirring tank feed valve 1-1, stirring tank tail gas outlet valve 1-2, filter circulation valve 1-3, stirring tank discharge pump 1-4, filter 2, filter overflow valve 2-1, filter discharge valve 2-2, receiving tank 3, receiving tank tail gas outlet valve 3-1, receiving tank discharge pump 3-2, spiral plate heat exchanger 4, cooling water outlet valve 4-1, cooling water inlet valve 4-2, solvent recovery tank 5, solvent recovery tank discharge valve 5-1, induced draft fan 6, gas buffer tank 7, flame arrester 7-1, buffer tank bottom valve 7-2; DETAILED DESCRIPTION

[0014] The following is a further detailed description of the filtering tail gas recovery device for alkyd resin production according to the present invention through the accompanying drawings and specific embodiments.

[0015] like Figure 1As shown, the filtering tail gas recovery device in the production of alkyd resin of the present invention includes a stirring tank 1, a filter 2, a receiving tank 3, a spiral plate heat exchanger 4, a solvent recovery tank 5, an induced draft fan 6, and a gas buffer tank 7; the top of the stirring tank 1 is provided with a stirring tank feed valve 1-1, a stirring tank tail gas outlet valve 1-2 and a filter circulation valve 1-3, the upper side of the stirring tank 1 is connected to the upper part of the filter 2 through a filter overflow valve 2-1 pipeline, and the bottom outlet of the stirring tank 1 is connected to the bottom of the filter 2 after connecting to the stirring tank feed pump 1-4; the discharge pipe on the lower side of the filter 2 is divided into two routes, one route is connected to the receiving tank 3 through the filter discharge valve 2-2, and the other route is connected to the filter circulation valve 1-3; the bottom discharge of the receiving tank 3 The pipe is connected to the receiving tank discharge pump 3-2 and then connected to the finished product storage tank. The tail gas pipeline with the receiving tank tail gas outlet valve 3-1 located on the upper part of the receiving tank 3 is connected to the side air inlet of the spiral plate heat exchanger 4 after merging with the tail gas pipeline with the stirring tank tail gas outlet valve 1-2; the upper air outlet of the spiral plate heat exchanger 4 is connected to the gas buffer tank 7 after being connected to the induced draft fan 6, and a cooling water outlet valve 4-1 is provided on the upper side, and a cooling water inlet valve 4-2 is provided on the lower side; the upper part of the gas buffer tank 7 is connected to the flame arrester 7-1, and the lower outlet pipeline is merged with the bottom discharge pipeline of the spiral plate heat exchanger 4 after being connected to the buffer tank bottom valve 7-2, and then connected to the top of the solvent recovery tank 5, and a solvent recovery tank discharge valve 5-1 is provided at the bottom of the solvent recovery tank 5.

[0016] During operation, the alkyd resin in the dilution kettle enters the stirring tank 1 through the stirring tank feed valve 1-1, and then the corresponding diatomaceous earth filter aid is added and stirring is started. Since the temperature of the alkyd resin is around 120°C, the solvent will evaporate into gas, so the induced draft fan 6 needs to be turned on while stirring is started, and the stirring tank tail gas outlet valve 1-2 is opened to draw the evaporated solvent tail gas from the stirring tank 1 into the spiral plate heat exchanger 4, and the solvent liquid is cooled by heat exchange and flows into the solvent recovery tank 5; after the alkyd resin and the diatomaceous earth filter aid are evenly mixed, the stirring tank discharge pump 1-4 is turned on to pump the alkyd resin from the stirring tank 1 into the filter 2, and the filter overflow valve 2-1 is opened when the alkyd resin flows out. Open the filter circulation valve 1-3, close the filter overflow valve 2-1 to allow the alkyd resin to circulate in the filter 2 and the mixing tank 1, so that the diatomaceous earth adheres to the filter plate to form a filter cake; after the filter cake is formed, take a sample to observe whether the fineness of the alkyd resin is qualified, and when the alkyd resin fineness is qualified, open the filter discharge valve 2-2 to start discharging to the receiving tank 3, open the receiving tank discharge pump 3-2 to pump the alkyd resin into the finished product storage tank, and at the same time open the receiving tank tail gas outlet valve 3-1 to extract the volatilized solvent tail gas from the receiving tank 3 to the spiral plate heat exchanger 4, heat exchange and cool it into a solvent liquid that flows to the solvent recovery tank 5; finally, the solvent is recovered through the solvent recovery tank discharge valve 5-1 for reuse.

[0017] After the induced draft fan 6 is turned on, the buffer tank bottom valve 7-2 and the solvent recovery tank discharge valve 5-1 need to be in a closed state.

Claims

1. A filtered tail gas recovery device for alkyd resin production, characterized by: It comprises a stirring tank (1), a filter (2), a receiving tank (3), a spiral plate heat exchanger (4), a solvent recovery tank (5), an induced draft fan (6), and a gas buffer tank (7); the top of the stirring tank (1) is provided with a stirring tank feed valve (1-1), a stirring tank tail gas outlet valve (1-2), and a filter circulation valve (1-3); the upper side of the stirring tank (1) is connected to the upper part of the filter (2) through a filter overflow valve (2-1) pipeline; the bottom outlet of the stirring tank (1) is connected to the bottom of the filter (2) after being connected to the stirring tank feed pump (1-4); the discharge pipe on the lower side of the filter (2) is divided into two paths, one path is connected to the receiving tank (3) through the filter discharge valve (2-2), and the other path is connected to the filter circulation valve (1-3); the discharge pipe at the bottom of the receiving tank (3) is connected to the receiving tank. The discharge pump (3-2) is connected to the finished product storage tank, and the tail gas pipeline with the tail gas outlet valve (3-1) of the receiving tank arranged on the upper part of the receiving tank (3) is connected to the side air inlet of the spiral plate heat exchanger (4) after merging with the tail gas pipeline with the tail gas outlet valve (1-2) of the stirring tank; the upper air outlet of the spiral plate heat exchanger (4) is connected to the gas buffer tank (7) after being connected to the induced draft fan (6), and the upper side is provided with a cooling water outlet valve (4-1), and the lower side is provided with a cooling water inlet valve (4-2); the upper part of the gas buffer tank (7) is connected to the flame arrester (7-1), and the lower outlet pipeline is connected to the bottom discharge pipeline of the spiral plate heat exchanger (4) after being connected to the buffer tank bottom valve (7-2), and then connected to the top of the solvent recovery tank (5), and the bottom of the solvent recovery tank (5) is provided with a solvent recovery tank discharge valve (5-1).

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