CN105004145A - 2-benzothiazolethiol nitrogen circulation drying and solvent recovery method - Google Patents
2-benzothiazolethiol nitrogen circulation drying and solvent recovery method Download PDFInfo
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- CN105004145A CN105004145A CN201510479511.0A CN201510479511A CN105004145A CN 105004145 A CN105004145 A CN 105004145A CN 201510479511 A CN201510479511 A CN 201510479511A CN 105004145 A CN105004145 A CN 105004145A
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Abstract
The invention relates to a 2-benzothiazolethiol nitrogen circulation drying and solvent recovery method. The method comprises the following steps: (1) conveying a 2-mercaptobenzothiazole wet material in a vacuum drying chamber of a vacuum paddle dryer, filling gaps between wedged blades with the 2-mercaptobenzothiazole wet material, meanwhile, introducing steam in a paddle shaft of the vacuum paddle dryer and a jacket of a housing of the vacuum paddle dryer, and thus obtaining the dried material and the evaporated moisture; (2)turning the dried material over an overflow weir to be discharged from a discharging opening, allowing the dried material to enter a seal buffer tank through a rotary discharge valve I, meanwhile, introducing nitrogen in the seal buffer tank for nitrogen sealing, and conveying the dried material to a next process by a rotary discharge valve II at the bottom of the seal buffer tank; (3) carrying the evaporated moisture out by hot nitrogen and allowing hot nitrogen to enter a cooling washing tower to be sprayed so as to obtain washed nitrogen; (4) pressurizing and heating washed nitrogen, enabling the pressurized and heated nitrogen to enter the vacuum paddle dryer to serve as a carrier gas for conveying the evaporated moisture for cyclic utilization. The method has the advantages of being safe, environment-friendly, and low in energy consumption.
Description
Technical field
The present invention relates to safety and environmental protection, energy-saving and cost-reducing technical field in the production of 2-benzothiazolyl mercaptan, particularly relate to a kind of 2-benzothiazolyl mercaptan cyclic nitrogen drying and method for recovering solvents.
Background technology
Existing 2-benzothiazolyl mercaptan industrial manufacture process adopts conventional air drying process.In 2-benzothiazolyl mercaptan is produced, after reaction, in 2-benzothiazolyl mercaptan wet feed, contain water, methanol solution and a small amount of CS
2, when dry to 2-benzothiazolyl mercaptan, the methyl alcohol in 2-benzothiazolyl mercaptan wet feed and CS need be removed
2, its process is: by 2-benzothiazolyl mercaptan is dry by pneumatic conveyer dryer after air heat, moisture, methyl alcohol and CS
2whole evaporation takes discharge out of by dry air.
This technology weak point is: technique adopts air open-circuit system, owing to containing a small amount of CS in 2-benzothiazolyl mercaptan wet feed
2, in dry run, often there is dodging quick-fried and CS
2there is excitant and toxicity, endanger personal safety, affect environment; Methanol solvate waste in 2-benzothiazolyl mercaptan wet feed is serious, discharges, cause waste while affecting environment in the process of drying with hot-air; Wet feed adopts air draught dry, and by Steam Heating air, the thermal efficiency is lower, consumes energy high.
Summary of the invention
Technical problem to be solved by this invention is to provide the low 2-benzothiazolyl mercaptan cyclic nitrogen drying of a kind of safety and environmental protection, energy consumption and method for recovering solvents.
For solving the problem, a kind of 2-benzothiazolyl mercaptan cyclic nitrogen drying of the present invention and method for recovering solvents, comprise the following steps:
(1) vacuum drying 2-benzothiazolyl mercaptan wet feed being transported to vacuum blade dryer is indoor, and is full of the gap of Wedge blade, and simultaneous temperature is that the steam of 110 ~ 120 DEG C passes in the paddle shaft of described vacuum blade dryer and the chuck of housing; Under the rotation of described paddle shaft, described 2-benzothiazolyl mercaptan wet feed is by described steam indirect, while move forward, obtaining temperature is respectively the dried material of 90 ~ 100 DEG C and the wet part evaporated;
(2) described dried material climbs over downflow weir and discharges from discharging opening, sealing surge tank is entered through rotary discharge valve I, simultaneously nitrogen inputs to described sealing surge tank and carries out nitrogen envelope, and the rotary discharge valve II of this dried material bottom sealing surge tank is transported to subsequent processing;
(3) the hot nitrogen that the wet part evaporated described in is 110 ~ 120 DEG C by the temperature from steam heater is taken described vacuum blade dryer out of and is entered cooling scrubbing tower; Solution simultaneously in described cooling scrubbing tower is transported in heat exchanger to drop to after 0 DEG C through circulating pump at the bottom of tower and sprays from the top of described cooling scrubbing tower, be that methyl alcohol, moisture and CS2 in the hot nitrogen of 90 ~ 100 DEG C washs by described temperature, obtain the nitrogen after washing;
(4) be transported to steam heater after the nitrogen after described washing is pressurizeed by circulating fan to heat, the nitrogen after this heating enters described vacuum blade dryer and recycles as carrying the carrier gas of the wet part of evaporation.
Described step (3) in heat exchanger be plate type heat exchanger or tubular heat exchanger.
The present invention compared with prior art has the following advantages:
1, the present invention adopts vacuum blade dryer, compared with Air Dried System, residence time of material is long, wet part evaporation evenly, and blade dryer good seal performance, can negative pressure run, the wet part in material just can be vaporized at low temperatures, can low temperature drying be realized, material sex change can be prevented and improving product quality
2, safety and environmental protection:
The present invention adopts the closed circuit drying system of nitrogen circulation, compared with air-flow open system, and the CS in 2-benzothiazolyl mercaptan wet feed
2do not contact with air, sudden strain of a muscle can not occur quick-fried, and without CS
2discharge.Primordial Qi fluidized drying system discharge exhausted air quantity is large simultaneously, and carries dust and organic solvent secretly, and the present invention only discharges fixed gas, and carries secretly without dust.
3, solvent recovery:
The present invention by the Methanol Recovery in circulating nitrogen gas through cooling scrubbing tower, is transported to subsequent handling process Posterior circle and utilizes, improve the economic benefit of enterprise.
4, consume energy low.
Primordial Qi stream open system tail gas takes away huge heat and the thermal efficiency of system own is low, and the present invention adopts Steam Heating and nitrogen heating, nitrogen amount used is much smaller than the air capacity of original technology, and the thermal efficiency of its system own is high, improve the efficiency of system, energy consumption is reduced.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is process chart of the present invention.
In figure: circulating pump at the bottom of 1-vacuum blade dryer, 2-cooling scrubbing tower, 3-circulating fan, 4-heat exchanger, 5-steam heater, 6-rotary discharge valve, I 7-sealing surge tank, 8-rotary discharge valve, II 9-tower.
Detailed description of the invention
As shown in Figure 1, a kind of 2-benzothiazolyl mercaptan cyclic nitrogen drying and method for recovering solvents, comprise the following steps:
(1) vacuum drying 2-benzothiazolyl mercaptan wet feed being transported to vacuum blade dryer 1 is indoor, and is full of the gap of Wedge blade, and simultaneous temperature is that the steam of 110 ~ 120 DEG C passes in the paddle shaft of vacuum blade dryer 1 and the chuck of housing; Under the rotation of paddle shaft, 2-benzothiazolyl mercaptan wet feed is by steam indirect, while move forward, obtaining temperature is respectively the dried material of 90 ~ 100 DEG C and the wet part evaporated.
(2) dried material climbs over downflow weir and discharges from discharging opening, sealing surge tank 7 is entered through rotary discharge valve I 6, simultaneously nitrogen inputs to sealing surge tank 7 and carries out nitrogen envelope, and the rotary discharge valve II 8 of this dried material bottom sealing surge tank 7 is transported to subsequent processing.
(3) the hot nitrogen that the wet part evaporated is 110 ~ 120 DEG C by the temperature from steam heater 5 is taken vacuum blade dryer 1 out of and is entered cooling scrubbing tower 2; The solution simultaneously cooled in scrubbing tower 2 is transported in heat exchanger 4 through circulating pump at the bottom of tower 9 the top spray dropped to from cooling scrubbing tower 2 after 0 DEG C, is that methyl alcohol, moisture and the CS2 in the hot nitrogen of 90 ~ 100 DEG C washs, obtains the nitrogen after washing by temperature.
Wherein: heat exchanger 4 is plate type heat exchanger or tubular heat exchanger.
(4) the nitrogen after washing is transported to steam heater 5 after being pressurizeed by circulating fan 3 and heats, and the nitrogen after this heating enters vacuum blade dryer 1 and recycles as carrying the carrier gas of the wet part of evaporation.
Claims (2)
1. 2-benzothiazolyl mercaptan cyclic nitrogen drying and a method for recovering solvents, comprises the following steps:
(1) vacuum drying 2-benzothiazolyl mercaptan wet feed being transported to vacuum blade dryer (1) is indoor, and being full of the gap of Wedge blade, simultaneous temperature is that the steam of 110 ~ 120 DEG C passes in the paddle shaft of described vacuum blade dryer (1) and the chuck of housing; Under the rotation of described paddle shaft, described 2-benzothiazolyl mercaptan wet feed is by described steam indirect, while move forward, obtaining temperature is respectively the dried material of 90 ~ 100 DEG C and the wet part evaporated;
(2) described dried material climbs over downflow weir and discharges from discharging opening, sealing surge tank (7) is entered through rotary discharge valve I (6), simultaneously nitrogen inputs to described sealing surge tank (7) and carries out nitrogen envelope, and the rotary discharge valve II (8) of this dried material through sealing surge tank (7) bottom is transported to subsequent processing;
(3) the hot nitrogen that the wet part evaporated described in is 110 ~ 120 DEG C by the temperature from steam heater (5) is taken described vacuum blade dryer (1) out of and is entered cooling scrubbing tower (2); Solution simultaneously in described cooling scrubbing tower (2) is transported in heat exchanger (4) to drop to after 0 DEG C through circulating pump at the bottom of tower (9) and sprays from the top of described cooling scrubbing tower (2), be that methyl alcohol, moisture and CS2 in the hot nitrogen of 90 ~ 100 DEG C washs by described temperature, obtain the nitrogen after washing;
(4) the nitrogen after described washing heats by being transported to steam heater (5) after circulating fan (3) pressurization, and the nitrogen after this heating enters described vacuum blade dryer (1) and recycles as carrying the carrier gas of the wet part of evaporation.
2. a kind of 2-benzothiazolyl mercaptan cyclic nitrogen drying as claimed in claim 1 and method for recovering solvents, is characterized in that: described step (3) in heat exchanger (4) be plate type heat exchanger or tubular heat exchanger.
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| CN201510479511.0A CN105004145A (en) | 2015-08-03 | 2015-08-03 | 2-benzothiazolethiol nitrogen circulation drying and solvent recovery method |
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| CN201510479511.0A CN105004145A (en) | 2015-08-03 | 2015-08-03 | 2-benzothiazolethiol nitrogen circulation drying and solvent recovery method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105352268A (en) * | 2015-12-02 | 2016-02-24 | 杭州良盛机械有限公司 | Liquid drying and recovery system |
| CN106352683A (en) * | 2016-10-20 | 2017-01-25 | 北京石油化工工程有限公司 | Catalyst precursor industrial drying method capable of being easily influenced by temperature and oxygen and system thereof |
| CN111592453A (en) * | 2019-02-21 | 2020-08-28 | 上海凯赛生物技术股份有限公司 | Method for removing/recovering organic solvent in long-chain dicarboxylic acid |
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| US5966838A (en) * | 1996-09-26 | 1999-10-19 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Process and apparatus for drying material with indirectly heated driers and for decontaminating waste gas |
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| CN101315250A (en) * | 2008-04-30 | 2008-12-03 | 中国石油化工股份有限公司 | Drying technique in production process of terephthalic acid/m-phthalic acid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105352268A (en) * | 2015-12-02 | 2016-02-24 | 杭州良盛机械有限公司 | Liquid drying and recovery system |
| CN106352683A (en) * | 2016-10-20 | 2017-01-25 | 北京石油化工工程有限公司 | Catalyst precursor industrial drying method capable of being easily influenced by temperature and oxygen and system thereof |
| CN111592453A (en) * | 2019-02-21 | 2020-08-28 | 上海凯赛生物技术股份有限公司 | Method for removing/recovering organic solvent in long-chain dicarboxylic acid |
| CN111592453B (en) * | 2019-02-21 | 2023-07-25 | 上海凯赛生物技术股份有限公司 | Method for removing/recovering organic solvent in long-chain dibasic acid |
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Application publication date: 20151028 |
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