Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Non-liquid-phase production method of phthalonitrile

A technology of phthalonitrile and its production method, which is applied in the direction of chemical instruments and methods, ammonium nitrate, carboxylic acid nitrile purification/separation, etc., can solve the problems of increasing by-products, loss of products, excessive nitrogen oxides, etc., and achieve The effect of avoiding hydrolysis loss

Pending Publication Date: 2021-09-24
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of water intensifies the hydrolysis of cyano groups, loss of product and increase of by-products
Solid-liquid separation is a complex and energy-consuming device. The waste water produced contains ammonia and nitrogen oxides seriously exceeding the standard; it contains highly toxic nitriles and requires a special nitrile breaking device, which is very expensive

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
  • Non-liquid-phase production method of phthalonitrile
  • Non-liquid-phase production method of phthalonitrile
  • Non-liquid-phase production method of phthalonitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]P-xylene, ammonia and air with a molar ratio of 1:6:34, after gasification and preheating, enter the fluidized bed reactor to generate dicyanophthalonitrile and water. A U-shaped coil is installed in the reactor, and condensed water is introduced to remove the heat of reaction by producing steam to maintain a reaction temperature of 390°C. The reaction pressure is 15kPa(G). The reaction product gas passes through the water-free condensers A, B, and C in step 1. Use 40°C desalinated water in the heat exchange tubes of anhydrous condensers A, B, and C to remove heat, and control the temperature in the shells of anhydrous condensers A, B, and C to 50°C. Part of the liquid from the crude liquid pump is returned to the tops of the anhydrous condensers A, B, and C for spraying. At this time, the inlet / outlet of the reaction product gas of the anhydrous condensers D and E has been closed, and it is in the process of step 2. Steam at 180°C is introduced into the heat exchange ...

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

No PUM Login to View More

Abstract

The invention provides a non-liquid-phase production method of phthalonitrile, which comprises the following steps: reacting generated gas containing phthalonitrile is discharged from an ammoxidation reactor, after the reacting generated gas passes through an anhydrous condenser, the phthalonitrile is cooled and collected, and the residual reacting generated gas is enabled to leave the anhydrous condenser; the anhydrous condenser is adotped to carry out the following steps and circulate: step 1, opening a reacting generated gas inlet / outlet of the anhydrous condenser, introducing the reacting generated gas containing the phthalonitrile into the anhydrous condenser, adding a cold medium into the anhydrous condenser for cooling, so that the phthalonitrile is changed into a liquid state or a solid state and is separated from the reacting generated gas; 2, closing the reacting generated gas inlet / outlet of the anhydrous condenser, adding a thermal medium to increase the temperature so that the phthalonitrile becomes a liquid state, and enabling the liquid state to flow out from a liquid state outlet in the bottom of the anhydrous condenser; and 3, closing the reacting generated gas inlet / outlet of the anhydrous condenser, adding a cold medium, cooling, and preparing to carry out the step 1. According to the method, no external water is added, so that the hydrolysis loss of phthalonitrile and the generation of wastewater are avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a non-liquid-phase production method of phthalonitrile. Background technique [0002] Phthalonitrile is generally produced by reacting xylene with ammonia and oxygen. Oxygen is generally provided by air. In the reaction gas, nitrogen, oxygen and ammonia account for a very large proportion, followed by the water vapor generated by the reaction, and the proportion of phthalonitrile is generally only 1-3%, and there are also a small amount of various by-products. The reaction gas pressure is generally normal pressure or slightly positive pressure, so the partial pressure of phthalonitrile is very low, lower than 5kPa. To separate phthalonitrile from the reaction gas, cooling is required, but there are several difficulties: ① There is no liquid state of phthalonitrile at low partial pressure, and the gaseous state changes directly into a solid state when the t...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C255/51C07C253/28C07C253/34C01C1/18
CPCC07C253/28C07C253/34C01C1/185C07C255/51
Inventor 宋国天唐印孔德利秦艳妮
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com