CN102351816A - Recycling system for low-boiling point substance in furfural production - Google Patents
Recycling system for low-boiling point substance in furfural production Download PDFInfo
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- CN102351816A CN102351816A CN2011102298543A CN201110229854A CN102351816A CN 102351816 A CN102351816 A CN 102351816A CN 2011102298543 A CN2011102298543 A CN 2011102298543A CN 201110229854 A CN201110229854 A CN 201110229854A CN 102351816 A CN102351816 A CN 102351816A
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- point substance
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Abstract
The invention discloses a recycling system for a low-boiling-point substance in furfural production. The recycling system comprises a stock solution condenser, a stock solution tank, a primary tower, an overhead condenser, an aldehyde separation device, a crude aldehyde measuring tank, a waste gas mixing box, a tower bottom heater, a tail gas semi-condenser and a gas-liquid separator. In the invention, the low-boiling point substance is separated from aldehyde gas before the aldehyde gas enters into a fractionator to be used as combustion-supporting gas of a boiler, thereby avoiding the pollution of the low-boiling point substance on the environment and the influence on separative efficiency of the fractionator, improving the distillation efficiency and simultaneously improving the yield of furfural.
Description
Technical field
The present invention relates to a kind of recycling system of low-boiling-point substance, the recycling system of low-boiling-point substance during especially a kind of furfural is produced.
Background technology
Hydrolysis workshop section in furfural is produced, the furfural gas mixture process condensation for the first time by extraction in the hydrolysis kettle becomes liquid state, and industry is called stoste.For guaranteeing that primary tower can normally, balanced evaporate, former liquid temp is controlled by processing condition, so can not make temperature drop to minimum, so stoste some noncondensable gas before going into primary tower must be discharged, this part noncondensable gas is called tail gas.Major ingredient is a low-boiling-point substance in this part noncondensable gas of discharging, and mainly is made up of acetone (56.5 ℃ of boiling points), methyl alcohol (64.65 ℃ of boiling points), acetate, methyl, ethyl furfural and the uncooled furfural of part.
Because each factory's flow-route and temperature of furfural industry and condenser effect are different; Temperature is controlled between 75-90 ℃; Growth along with temperature; The corresponding increase of furfural amount of being taken out of in the noncondensable gas; If this part noncondensable gas adopts full closeding state to get into primary tower, form half gas, half liquid status, can seriously disturb the evaporation of primary tower; Cause tower top temperature to descend or instability, make aldehyde contenting amount increase in the waste water under the tower.Make aldehyde in the aldehyde distributing device, aqueous phase interface unclear, muddy when serious.Aldehyde and water can not well separated, and productive rate is descended, so tail gas is very big to the primary tower influence.
The most of factory of China adopts the uncontrollable discharge form that noncondensable gas is drained at present; Because contained low-boiling-point substance acetone in the noncondensable gas, methyl alcohol and other objectionable impurities cause bigger pollution to environment; The smell of factory is pungent, and operator are caused actual bodily harm in various degree.Chinese patent 200720093140.3 discloses a kind of oxygen degassing and has removed the low-boiling-point substance device; The device of this application can only be removed the low-boiling-point substance in the waste water; Reached the with serious pollution problem of discharge of wastewater, but can not fundamentally eliminate the influence of low-boiling-point substance total system.
Summary of the invention
The technical problem that the present invention will solve provide have the separation efficiency height, a kind of furfural of environmental protection, advantage such as energy-conservation produce in the recycling system of low-boiling-point substance.
For solving the problems of the technologies described above, the technical scheme that the present invention taked is:
The recycling system of low-boiling-point substance comprises in the furfural production of the present invention: well heater at the bottom of stoste condenser, original fluid container, primary tower, overhead condenser, aldehyde distributing device, thick aldehyde scale tank, waste gas blending bin, the tower, and its improvements are also to comprise tail gas half condenser, vapour liquid separator;
Wherein, the outlet of the tail gas at said original fluid container top is connected through the opening for feed of first pipeline with tail gas half condenser;
The opening for feed of said vapour liquid separator is connected through the discharge port of second pipeline with tail gas half condenser; The vapor phase exit of vapour liquid separator is connected through the import of the 4th pipeline with the waste gas blending bin, and the liquid phase outlet of vapour liquid separator is connected with the opening for feed of aldehyde distributing device through the 3rd pipeline.
Adopt the beneficial effect that technique scheme produced to be:
1. the characteristics that are difficult for condensation according to low-boiling-point substance; Adopt secondary half condenser to make wherein aldehyde and vapor condensation; Separate through vapour liquid separator then; Low-boiling-point substance is wherein separated the combustion-supporting gas as boiler; The low-boiling-point substance pollution on the environment of avoiding; Make the aldehyde contenting amount in the waste water under the tower, be reduced to 0.048% by original 0.1%.
2. send into boiler and do combustion-supporting air-supply, make boiler furnace heat up combustion-supporting and minimizing fuel, strengthened combustion efficacy, this waste gas is nonpoisonous and tasteless behind high-temp combustion, after wet dedusting, becomes water vapor and enters in the atmosphere, has solved the pollution of waste gas to ambient atmosphere fully.
3. system of the present invention has solved low-boiling-point substance to the primary tower influence of evaporation, has increased distillation efficiency, has improved the yield of furfural simultaneously.
4. tail gas is behind time condensation, and furfural wherein obtains reclaiming, thereby furfural yield is obviously improved.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
Fig. 1 is a structural representation of the present invention;
Wherein, 1 stoste condenser; 2 original fluid containers; 3 tail gas, half condenser; 4 vapour liquid separators; 5 primary towers; 6 overhead condensers; 7 aldehyde distributing devices; 8 thick aldehyde scale tanks; 9 waste gas blending bins; Well heater 11 first pipelines at the bottom of 10 towers; 12 second pipelines; 13 the 3rd pipelines; 14 the 4th pipelines; 15 feed-pipes; 16 waste pipes.
Embodiment
The recycling system of low-boiling-point substance comprises in the furfural production of the present invention: well heater 10 at the bottom of stoste condenser 1, original fluid container 2, primary tower 5, overhead condenser 6, aldehyde distributing device 7, thick aldehyde scale tank 8, waste gas blending bin 9, the tower also comprises tail gas half condenser 3, vapour liquid separator 4;
Wherein, the outlet of the tail gas at said original fluid container 2 tops is connected through the opening for feed of first pipeline 11 with tail gas half condenser 3;
The opening for feed of said vapour liquid separator 4 is connected through the discharge port of second pipeline 12 with tail gas half condenser 3; The vapor phase exit of vapour liquid separator 4 is connected with the import of waste gas blending bin 9 through the 4th pipeline 14, and the liquid phase outlet of vapour liquid separator 4 is connected with the opening for feed of aldehyde distributing device 7 through the 3rd pipeline 13.
When the present invention works, get into after well heater 10 heats at the bottom of the towers through feed-pipe 15, get into original fluid container 2 through stoste condenser 1 condensation (control condensing temperature should at 80-85 ℃) from the aldehyde vapour of hydrolysis kettle;
The liquid of original fluid container 2 bottoms directly gets into primary tower 5 and carries out fractionation, and the tail gas at original fluid container 2 tops gets into tail gas half condenser 3 through first pipeline 11 and carries out condensation (the control condensing temperature is 66-70 ℃);
The tail gas condensation is after second pipeline, 12 entering vapour liquid separators 4 separate, and the liquid phase of vapour liquid separator 4 bottoms gets into aldehyde distributing devices 7 through the 3rd pipeline 13 and separates; Vapour liquid separator 4 isolated vapour phases get into waste gas blending bin 9 through the 4th pipeline 14, remove boiler auxiliary combustion through waste pipe 16;
The aldehyde vapour that primary tower 5 cats head obtain gets into aldehyde distributing device 7 through overhead condenser 6 condensations (37-45 ℃ of control condensing temperature) to be separated;
The isolated thick aldehyde in aldehyde distributing device 7 bottoms gets into thick aldehyde scale tank 8, and the water on aldehyde distributing device 7 tops gets into primary tower 5 and further distills.
Claims (1)
1. the recycling system of low-boiling-point substance during a furfural is produced; Comprise: well heater (10) at the bottom of stoste condenser (1), original fluid container (2), primary tower (5), overhead condenser (6), aldehyde distributing device (7), thick aldehyde scale tank (8), waste gas blending bin (9), the tower is characterized in that it also comprises tail gas half condenser (3), vapour liquid separator (4);
The tail gas outlet at said original fluid container (2) top is connected through the opening for feed of first pipeline (11) with tail gas half condenser (3);
The opening for feed of said vapour liquid separator (4) is connected through the discharge port of second pipeline (12) with tail gas half condenser (3); The vapor phase exit of vapour liquid separator (4) is connected through the import of the 4th pipeline (14) with waste gas blending bin (9), and the liquid phase outlet of vapour liquid separator (4) is connected through the opening for feed of the 3rd pipeline (13) with aldehyde distributing device (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102298543A CN102351816A (en) | 2011-08-11 | 2011-08-11 | Recycling system for low-boiling point substance in furfural production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102298543A CN102351816A (en) | 2011-08-11 | 2011-08-11 | Recycling system for low-boiling point substance in furfural production |
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| Publication Number | Publication Date |
|---|---|
| CN102351816A true CN102351816A (en) | 2012-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102298543A Pending CN102351816A (en) | 2011-08-11 | 2011-08-11 | Recycling system for low-boiling point substance in furfural production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104128014A (en) * | 2014-08-19 | 2014-11-05 | 衡水中科信能源有限公司 | Device and process for extracting methanol from low-boiling-point substance produced in furfurol production process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4088660A (en) * | 1976-01-07 | 1978-05-09 | Juhani Puurunen | Method for the separation and recovery of furfural and organic volatile acids, such as acetic acid and formic acid, from the process of preparation of furfural |
| CN101130531A (en) * | 2007-09-17 | 2008-02-27 | 济南圣泉集团股份有限公司 | System and method for producing furol with agricultural and forestry castoff |
| CN101696196A (en) * | 2009-10-27 | 2010-04-21 | 山东万盛环保科技发展有限公司 | Method for increasing furfural yield and recovering methanol |
| CN102093317A (en) * | 2009-12-09 | 2011-06-15 | 梨树县北方糠醛有限公司 | Novel environmentally-friendly production process for furfural |
-
2011
- 2011-08-11 CN CN2011102298543A patent/CN102351816A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4088660A (en) * | 1976-01-07 | 1978-05-09 | Juhani Puurunen | Method for the separation and recovery of furfural and organic volatile acids, such as acetic acid and formic acid, from the process of preparation of furfural |
| CN101130531A (en) * | 2007-09-17 | 2008-02-27 | 济南圣泉集团股份有限公司 | System and method for producing furol with agricultural and forestry castoff |
| CN101696196A (en) * | 2009-10-27 | 2010-04-21 | 山东万盛环保科技发展有限公司 | Method for increasing furfural yield and recovering methanol |
| CN102093317A (en) * | 2009-12-09 | 2011-06-15 | 梨树县北方糠醛有限公司 | Novel environmentally-friendly production process for furfural |
Non-Patent Citations (1)
| Title |
|---|
| 雷依庆，等: "糠醛生产的现状和发展趋势", 《山西化工》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104128014A (en) * | 2014-08-19 | 2014-11-05 | 衡水中科信能源有限公司 | Device and process for extracting methanol from low-boiling-point substance produced in furfurol production process |
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Application publication date: 20120215 |