Device for refining hexamethylene diisocyanate and method thereof
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of hexamethylene diisocyanate and rectifying tower is applied in the field of production equipment for refining hexamethylene diisocyanate, and can solve the problems of reduced yield, HDI polymerization, inoperability of distillation tower and the like
Inactive Publication Date: 2013-11-06
甘肃银光聚银化工有限公司
View PDF4 Cites 17 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0007] The distillation of HDI cannot be distilled according to the conventional method, because the solvent (such as o-dichlorobenzene) and impurities with a boiling point slightly lower than the boiling point of HDI must be distilled from the top of the tower during rough distillation, or the impurities must be distilled from the top of the tower during rectification. HDI, the bottom temperature of the tower is high, and HDI is prone to polymerization at high temperature for a long time, so that the yield will be reduced, and the polymer will increase to block the reboiler at the bottom of the tower or even block the tower so that the distillation tower cannot operate
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0020] Embodiment 1: process condition control is as follows table:
[0021]
[0022] Distillation steps
[0023] a Turn on the heat conduction oil furnace through the on-site control cabinet to make the temperature reach 205°C, and make a record.
[0024] b Close the valves on the top of the tower and the extraction pipeline of the tower kettle.
[0025] c. Open the feed valve of the first preheater 2. When the temperature reaches 90° C. and the jacket oil temperature of the distillation column (3) is higher than 95° C. and rises linearly, open the feed valve of the top of the tower and the automatic control of the tower.
[0026] d Open the circulating water valve of the first condenser 6 at the top of the tower.
[0027] e Start the first vacuum pump 7, control the vacuum degree to be 0.094Mpa, and make a record.
[0028] f Open the heat transfer oil flow regulating valve in the 3rd kettle of the distillation tower, start the heat transfer oil furnace oil pump, and co...
Embodiment 2
[0045] Embodiment 2: process condition control is as follows table:
[0046]
[0047] Operational steps according to the above conditions include:
[0048] a) Open the outlet valve of the crude product tank 1, open the feed valve of the first preheater 2, and start feeding when the temperature reaches 160-170°C, and the crude 1,6-hexamethylene diisocyanate solution enters the middle part of the distillation tower 3, the tower still 4 After the temperature is higher than 195°C, open the first condenser 6, start the first vacuum pump 7, and control the vacuum degree to 0.070-0.089Mpa; start to control the full reflux operation of the distillation tower 3 for half an hour, when the temperature at the top of the tower reaches the temperature required by the process, Sampling and analysis, when it meets the process requirements, start to slowly adjust to the specified reflux flow, sampling and analysis at the top of the tower, when the HDI content contained in the o-dichlorobenz...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention specifically relates to production equipment for refining hexamethylene diisocyanate and a method thereof. A stirrer is respectively arranged in the middle of the bottom of both a distillation column and a rectifying tower which are provided with a stirring device, and stirring wings are a frame type. The method for refining hexamethylene diisocyanate comprises the following steps: (1) letting an synthesized HDI solution enter a distillation column through a heat exchanger, starting a first vacuum pump, and starting a first stirrer in the column bottom while the agitation speed is less than or equal to 60rpm/min; Starting a first condenser on the tower top, evaporating all o-dichlorobenzene, continuously discharging by the distillation column and entering a mixing tank; and (ii) adding a DEIP solvent into the mixing tank, uniformly mixing crude HDI and the DEIP solvent according to the HDI-DEIP ratio of 1:1-1.5, sending the mixture into the rectifying tower to firstly evaporate mono-isocyanate chloride and continuously evaporate the HDI, drawing forth the DEIP for recycling, stirring high polymer residue in a heating vessel and discharging regularly, and carrying out burning treatment. The device and method provided by the invention can be applied in distillation separation and purification production technology which is easy to generate auto-agglutination phenomenon under the distillation condition.
Description
technical field [0001] The present invention relates to the production equipment and method of aliphatic diisocyanate, in particular to the production equipment and method of refining hexamethylene diisocyanate. Background technique [0002] As an important class of organic chemical intermediates, isocyanates are widely used in industry, agriculture, medicine and health. These compounds are widely used in the synthesis of polyisocyanates, polyurethanes, polyureas, polymer adhesives, insecticides, herbicides, etc. Hexamethylene diisocyanate (1,6-hexamethylene diisocyanate, English abbreviation HDI) is the aliphatic isocyanate with the largest demand in the polyurethane industry at present, and has become the successor toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI ), polymethyl polyphenylene isocyanate (PAPI), isocyanate species with large demand, mainly used in the production of automotive OEM coatings and repair paints, aircraft OEM coatings and repair paint...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more