CN102718666A - Method for preparing paratoluidine - Google Patents
Method for preparing paratoluidine Download PDFInfo
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- CN102718666A CN102718666A CN201210168664XA CN201210168664A CN102718666A CN 102718666 A CN102718666 A CN 102718666A CN 201210168664X A CN201210168664X A CN 201210168664XA CN 201210168664 A CN201210168664 A CN 201210168664A CN 102718666 A CN102718666 A CN 102718666A
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- preparing
- totuidine
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- paratoluidine
- reduced
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Abstract
The invention discloses a method for preparing paratoluidine. The method comprises steps of leading 0.48-0.54 part of hydrogen into paranitrotoluene at process temperature and performing reduction reaction in a reduction tower added with a catalyst; and then transferring a reduced product to a rectifying still and refining to obtain a final product. By the method for preparing paratoluidine, raw materials of products are effectively saved, energy loss is reasonably reduced, and production pollution is reduced.
Description
Technical field
The present invention relates to a kind of preparation method of Pigment Intermediates, specifically, relate to a kind of preparation method of para-totuidine.
Background technology
Producing para-totuidine at present generally is that the PNT reduction is got, and general production technique makes para-totuidine for reducing with sodium sulphite, the reaction solution standing demix, and branch vibration layer is then through underpressure distillation; Condensation; Crystallization; Drying gets finished product, and the sodium sulfide reducing method extensively adopts for domestic production producer at present, but production cost is higher, and it is more hard to manage to produce sewage and sewage, and product yield is low, has only 88.9%.
Summary of the invention
Technical problem to be solved by this invention provides a kind of can economizing in raw materials, and reduces unit consumption and reduces the method for polluting for preparing para-totuidine.
The present invention solves the scheme that its technical problem takes: a kind of preparation method of para-totuidine; PNT under the technological temperature condition is fed the hydrogen of 0.48-0.54 weight part and in being added with the reduction tower of catalyzer, carries out reduction reaction; Then reduzate is transferred to rectifying still and makes with extra care, obtain the finished product.
As preferably, the technological temperature in said is 70 ℃-80 ℃.
The invention has the beneficial effects as follows: the method for system para-totuidine provided by the invention has been practiced thrift the use of raw material effectively and has reasonably been reduced the loss of energy, reduced the pollution of producing.
Description of drawings:
Below in conjunction with accompanying drawing the present invention is further specified.
Fig. 1 is preparing method's process flow sheet of para-totuidine of the present invention.
Embodiment
Describe the present invention below in conjunction with accompanying drawing and embodiment:
The preparation method of a kind of para-totuidine shown in Figure 1; PNT under technological temperature (70 ℃-80 ℃) condition is fed the hydrogen of 0.48-0.54 weight part and in being added with the reduction tower of catalyzer, carries out reduction reaction; Then reduzate is transferred to rectifying still and makes with extra care, obtain the finished product.The method of system para-totuidine provided by the invention has been practiced thrift the use of raw material effectively and has reasonably been reduced the loss of energy, reduced the pollution of producing.
It is emphasized that: above only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction; Every foundation technical spirit of the present invention all still belongs in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (2)
1. the preparation method of a para-totuidine; It is characterized in that: the PNT under the technological temperature condition is fed the hydrogen of 0.48-0.54 weight part and in being added with the reduction tower of catalyzer, carries out reduction reaction; Then reduzate is transferred to rectifying still and makes with extra care, obtain the finished product.
2. the preparation method of para-totuidine according to claim 1, it is characterized in that: said technological temperature is 70 ℃-80 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210168664XA CN102718666A (en) | 2012-05-29 | 2012-05-29 | Method for preparing paratoluidine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210168664XA CN102718666A (en) | 2012-05-29 | 2012-05-29 | Method for preparing paratoluidine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102718666A true CN102718666A (en) | 2012-10-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210168664XA Pending CN102718666A (en) | 2012-05-29 | 2012-05-29 | Method for preparing paratoluidine |
Country Status (1)
| Country | Link |
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| CN (1) | CN102718666A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1220256A (en) * | 1997-10-07 | 1999-06-23 | 江苏淮河化工总厂 | Process for reduction of methylaniline from nitro-toluene |
| WO2002094434A1 (en) * | 2001-05-21 | 2002-11-28 | Basf Aktiengesellschaft | Ni/tio2 hydrogenation catalyst |
| CN102180801A (en) * | 2011-04-08 | 2011-09-14 | 高邮市助剂厂 | Production method of p-toluidine |
| CN102399154A (en) * | 2011-08-08 | 2012-04-04 | 江苏福斯特化工制造有限公司 | Method for producing methylaniline from nitrotoluene through liquid-phase hydrogenation reduction |
-
2012
- 2012-05-29 CN CN201210168664XA patent/CN102718666A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1220256A (en) * | 1997-10-07 | 1999-06-23 | 江苏淮河化工总厂 | Process for reduction of methylaniline from nitro-toluene |
| WO2002094434A1 (en) * | 2001-05-21 | 2002-11-28 | Basf Aktiengesellschaft | Ni/tio2 hydrogenation catalyst |
| CN102180801A (en) * | 2011-04-08 | 2011-09-14 | 高邮市助剂厂 | Production method of p-toluidine |
| CN102399154A (en) * | 2011-08-08 | 2012-04-04 | 江苏福斯特化工制造有限公司 | Method for producing methylaniline from nitrotoluene through liquid-phase hydrogenation reduction |
Non-Patent Citations (2)
| Title |
|---|
| 王学勤 等: "对硝基甲苯气相催化加氢的技术开发", 《化工进展》 * |
| 马旭 等: "一种新型催化剂用于对硝基甲苯催化氢化的研究", 《黑龙江商学院学报（自然科学版）》 * |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20121010 |