CN1392126A - Use of 2,6-dinitro p-cresol in preparing styrene as rectifying polymerization inhibitor - Google Patents
Use of 2,6-dinitro p-cresol in preparing styrene as rectifying polymerization inhibitor Download PDFInfo
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- CN1392126A CN1392126A CN 01115061 CN01115061A CN1392126A CN 1392126 A CN1392126 A CN 1392126A CN 01115061 CN01115061 CN 01115061 CN 01115061 A CN01115061 A CN 01115061A CN 1392126 A CN1392126 A CN 1392126A
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- dinitro
- cresol
- vinylbenzene
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Abstract
The present invention relates to the application of 2,6-dinitro p-cresol as rectifying polymerization inhibitor in preparing styrene. The polymerization inhibitor solution is compounded styrene or methyl benzene solution with 2,6-dinitro p-cresol in 10-15%, and is added into the styrene rectifying system in conventional technological condtiions. Inside the styrene in the bottom of rectifying circulation tower, the 2,6-dinitro p-cresol content is 1500-2500 ppm. The styrene product has low toxicity, low loss and yield rate ans high as 99.6-99.8% and the present invention has less side product tar and low cost and is superior to available technology.
Description
The invention belongs to stopper category in the organic high molecular compound preparation, relate in particular to 2, the 6-dinitro-p-cresol in the vinylbenzene preparation as the application of rectifying polymerization inhibitor.
Original stopper that uses in production of styrene is 2,2, 4-dinitrophenol, the big (LD of the toxicity of this product
50Be 20mg/kg), poorly soluble, big to workman's healthy and environmental hazard.
The objective of the invention is the stopper that a kind of toxicity is little, the solvability polymerization inhibition effect is high on probation, replace the stopper 2 that originally in production of styrene, uses, 2, 4-dinitrophenol.
Technical scheme of the present invention is: discuss a kind of 2, the 6-dinitro-p-cresol in the vinylbenzene preparation as the application of rectifying polymerization inhibitor.It is characterized in that: stopper adopts 2, the 6-dinitro-p-cresol is mixed with and contains 2, the vinylbenzene or the ethylbenzene solution of 6-dinitro-p-cresol 10～15% (or 10～12%), in the phenyl ethylene rectification system, inject inhibitor solution, move under the conventional rectification processing condition;
Stopper 2, the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column are 1500～2500ppm (or 1500～2000ppm or 2000～2500ppm).
Stopper 2,6-dinitro-p-cresol are to adopt to drip nitric acid in the fused 2-nitro-paracresol, and stirring down, reaction makes.
The stopper 2 that the present invention adopts, 6-dinitro-p-cresol and the stopper 2 that originally in production of styrene, uses, 2, 4-dinitrophenol is compared, and its advantage is:
1. toxicity is low, LD
50Be 95mg/kg; Be 2,2, 4-dinitrophenol toxic 1/5～1/4.
2. unit consumption is low, 0.5～0.6kg/TSM; Be former stopper 2, about 1/3 of 2, 4-dinitrophenol unit consumption.
3. productive rate height, vinylbenzene productive rate 99.6～99.8%; Than adopting 2, during 2, 4-dinitrophenol, productive rate is high by 0.7～1%.
4. by-product tar is few, and the present invention of tar generation is 30～38kg/h; 80～85kg/h during former stopper.
5. reducing cost significantly, adopt the present invention to reduce cost 36.45 yuan/ton, is example to produce 60000 tons of cinnamic certain factories per year, 218.76 ten thousand yuan of annual benefits.
The present invention is further elaborated below in conjunction with embodiment:
Embodiment one stopper 2,6-dinitro-p-cresol are to adopt to drip nitric acid in the fused 2-nitro-paracresol, and stirring down, reaction makes.2, the 6-dinitro-p-cresol is dissolved into 10～11% styrene solution, injects stopper in the phenyl ethylene rectification system, moves under the conventional rectification processing condition.
Stopper 2, the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 1500～2000ppm.Vinylbenzene productive rate 99.6%, 2,6-dinitro-p-cresol unit consumption 0.50kg/t vinylbenzene, the tar generation is 30～32kg/h.
Embodiment 22, and the 6-dinitro-p-cresol is dissolved into 11～12% ethylbenzene solution, stopper 2, and the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 2000～2500ppm.Vinylbenzene productive rate 99.7%, 2,6-dinitro-p-cresol unit consumption 0.55kg/t vinylbenzene, the tar generation is 32～34kg/h, all the other are with example one.
Embodiment 32, and the 6-dinitro-p-cresol is dissolved into 11～12% styrene solution, stopper 2, and the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 2000～2500ppm.Vinylbenzene productive rate 99.8%, 2,6-dinitro-p-cresol unit consumption 0.59kg/t vinylbenzene, the tar generation is 32～33kg/h, all the other are with example one.
Embodiment 42, and the 6-dinitro-p-cresol is dissolved into 14～15% ethylbenzene solution, stopper 2, and the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 1500～2000ppm.Vinylbenzene productive rate 99.7%, 2,6-dinitro-p-cresol unit consumption 0.60kg/t vinylbenzene, the tar generation is 33～34kg/h, all the other are with example one.
Embodiment 52, and the 6-dinitro-p-cresol is dissolved into 12～13% styrene solution, stopper 2, and the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 2000～2500ppm.Vinylbenzene productive rate 99.8%, 2,6-dinitro-p-cresol unit consumption 0.54kg/t vinylbenzene, the tar generation is 31～32kg/h, all the other are with example one.
Embodiment 62, and the 6-dinitro-p-cresol is dissolved into 13～14% ethylbenzene solution, stopper 2, and the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 1500～2000ppm.Vinylbenzene productive rate 99.6%, 2,6-dinitro-p-cresol unit consumption 0.59kg/t vinylbenzene, the tar generation is 33～34kg/h, all the other are with example one.
Embodiment 72, and the 6-dinitro-p-cresol is dissolved into 14～15% styrene solution, stopper 2, and the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 1500～2000ppm.Vinylbenzene productive rate 99.7%, 2,6-dinitro-p-cresol unit consumption 0.55kg/t vinylbenzene, the tar generation is 32～33kg/h, all the other are with example one.
Embodiment 82, and the 6-dinitro-p-cresol is dissolved into 12～13% ethylbenzene solution, stopper 2, and the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 2000～2500ppm.Vinylbenzene productive rate 99.6%, 2,6-dinitro-p-cresol unit consumption 0.54kg/t vinylbenzene, the tar generation is 31～32kg/h, all the other are with example one.
Embodiment 92, and the 6-dinitro-p-cresol is dissolved into 11～12% styrene solution, stopper 2, and the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 2000～2500ppm.Vinylbenzene productive rate 99.8%, 2,6-dinitro-p-cresol unit consumption 0.59kg/t vinylbenzene, the tar generation is 32～33kg/h, all the other are with example one.
Embodiment 10, and the 6-dinitro-p-cresol is dissolved into 14～15% ethylbenzene solution, stopper 2, and the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 1500～2000ppm.Vinylbenzene productive rate 99.7%, 2,6-dinitro-p-cresol unit consumption 0.55kg/t vinylbenzene, the tar generation is 35～36kg/h, all the other are with example one.
Embodiment 11, and the 6-dinitro-p-cresol is dissolved into 12～13% styrene solution, stopper 2, and the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 2000～2500ppm.Vinylbenzene productive rate 99.6%, 2,6-dinitro-p-cresol unit consumption 0.60kg/t vinylbenzene, the tar generation is 37～38kg/h, all the other are with example one.
Claims (7)
1. one kind 2, the 6-dinitro-p-cresol in vinylbenzene preparation as the application of rectifying polymerization inhibitor.
2. according to claim 1 described 2, the 6-dinitro-p-cresol in vinylbenzene preparation as the application of rectifying polymerization inhibitor, it is characterized in that: stopper adopts 2, the 6-dinitro-p-cresol, be mixed with and contain 2, the vinylbenzene of 6-dinitro-p-cresol 10～15% or ethylbenzene solution inject inhibitor solution in the phenyl ethylene rectification system, move under the conventional rectification processing condition.
3. according to claim 2 described 2, the 6-dinitro-p-cresol in vinylbenzene preparation as the application of rectifying polymerization inhibitor, it is characterized in that: stopper adopts 2, the 6-dinitro-p-cresol, be mixed with and contain 2, the vinylbenzene of 6-dinitro-p-cresol 10～12% or ethylbenzene solution inject inhibitor solution in the phenyl ethylene rectification system, move under the conventional rectification processing condition.
4. according to claim 2,3 described 2, as the application of rectifying polymerization inhibitor, it is characterized in that: stopper 2, the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 1500～2500ppm to the 6-dinitro-p-cresol in the vinylbenzene preparation.
5. according to claim 2,3 described 2, as the application of rectifying polymerization inhibitor, it is characterized in that: stopper 2, the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 1500～2000ppm to the 6-dinitro-p-cresol in the vinylbenzene preparation.
6. according to claim 2,3 described 2, as the application of rectifying polymerization inhibitor, it is characterized in that: stopper 2, the content of 6-dinitro-p-cresol in vinylbenzene at the bottom of the rectifying recycle column is 2000～2500ppm to the 6-dinitro-p-cresol in the vinylbenzene preparation.
7. according to claim 1,2,3 described 2, the 6-dinitro-p-cresol in vinylbenzene preparation as the application of rectifying polymerization inhibitor, it is characterized in that: stopper 2,6-dinitro-p-cresol are to adopt to drip nitric acid in the fused 2-nitro-paracresol, and stirring down, reaction makes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115061 CN1392126A (en) | 2001-06-16 | 2001-06-16 | Use of 2,6-dinitro p-cresol in preparing styrene as rectifying polymerization inhibitor |
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| CN 01115061 CN1392126A (en) | 2001-06-16 | 2001-06-16 | Use of 2,6-dinitro p-cresol in preparing styrene as rectifying polymerization inhibitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101240169B (en) * | 2008-03-10 | 2011-12-21 | 上海华谊丙烯酸有限公司 | Reutilizing method for phenol coke tar waste slag |
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2001
- 2001-06-16 CN CN 01115061 patent/CN1392126A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101240169B (en) * | 2008-03-10 | 2011-12-21 | 上海华谊丙烯酸有限公司 | Reutilizing method for phenol coke tar waste slag |
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