Method for preparing p-nitrobenzoic acid from waste polystyrene

A technology for waste polystyrene and p-nitrobenzoic acid is applied in the preparation of nitro compounds, organic chemistry, etc., and can solve the problems of unsatisfactory results, long process steps, low purity, etc., to increase yield and reduce production costs. , to avoid the effect of multi-step operation

Inactive Publication Date: 2009-04-15
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current techniques for preparing p-nitrobenzoic acid and its derivatives from waste polystyrene are processed by

Method used

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  • Method for preparing p-nitrobenzoic acid from waste polystyrene

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Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: the preparation of catalyst I (Fe 2+ and Zn 2+ complexed to sepiolite).

[0032] Using the hydrothermal method, in 1L of water, put 100g of sepiolite particles and 1mol / L of FeCl 2 , reacted at 230°C for 8 hours to make Fe 2+ Precipitate on the sepiolite carrier; take out the sepiolite and dry it at 120°C, and keep it at 50°C for 5 hours; put the complexed Fe 2+ Put the sepiolite containing 0.25mol / L ZnCl 2 In the water, the ratio of sepiolite particles to water is 100g / L, react at 260°C for 8 hours, and precipitate Zn 2+ ; After taking out the sepiolite and drying it at 120°C, it was kept at 50°C for 5 hours to prepare the catalyst I.

Embodiment 2

[0033] Embodiment 2: the preparation of catalyst II (Fe 2+ and Ni 2+ complexed to sepiolite).

[0034] Using the hydrothermal method, put 150g of sepiolite particles and 1mol / L of FeCl in 1L of water 2 , reacted at 240°C for 10 hours to make Fe 2+ Precipitate on the sepiolite carrier; take out the sepiolite and dry it at 130°C, and keep it at 50°C for 8 hours; put the complexed Fe 2+ Put the sepiolite containing 1mol / L NiCl 2 In the water, the ratio of sepiolite particles to water is 150g / L, react at 270°C for 10 hours, precipitate Ni 2+ ; After taking out the sepiolite and drying it at 120°C, it was kept at 50°C for 6 hours to prepare Catalyst II.

Embodiment 3

[0036] After defoaming the ordinary waste polystyrene organic solvent, use a pulverizer to pulverize to obtain polystyrene powder, add 1g of the above powder to the reaction bottle of the microwave reactor, add nitric acid by 9.5 times the mass of polystyrene, and press polystyrene 5% of the mass of styrene is added to Catalyst I, and then put into a magnetic rotor to mix and react. The reaction time of the microwave reactor is set to 30min, the set reaction temperature is 200°C, the set reaction pressure is 2.0MPa, and the reaction power is 1200W. After the reaction is over, pour it into a beaker while it is hot, and cool to room temperature to precipitate p-nitrobenzoic acid. Filter with a sand core funnel, wash with distilled water to remove residual acid, and then filter. Pour heated ethanol into the funnel to fully rinse the product, and then pour it into a beaker. Then heated to boiling and stirred with a glass rod for about 10min, then filtered while hot to obtain the...

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Abstract

The invention provides a method for preparing p-nitrobenzoic acid utilizing waste polystyrene: waste polystyrene is defoamed and crashed and then is put into a reaction bulb of a microwave reactor; nitrated oxidant and catalyst are added; reaction temperature, reaction pressure, and microwave power are set; stirring with magnetic force is carried out for 10min-4h; after the reaction, the temperature is cooled to the room temperature to precipitate p-nitrobenzoic acid which is made after pickling and crystallization. For raw material, the invention turns waste polystyrene into treasure; simultaneously, disadvantages of a common method of multi-step operation, low yield coefficient and purity are avoided. Compared with traditional methods, the invention has obvious improvement in purity and yield coefficient of p-nitrobenzoic acid made by one-step microwave method, high productivity effect, and good application prospect in industry. The method for preparing p-nitrobenzoic acid utilizing waste polystyrene makes complexation of two kinds of metallic ions on a sepiolite to form novel catalyst and has a good reaction effect, thus increasing the product yield and lowering the production cost.

Description

technical field [0001] The present invention relates to a kind of preparation method of organic acid, specifically, relate to a kind of method of utilizing waste polystyrene to prepare p-nitrobenzoic acid. Background technique [0002] p-Nitrobenzoic acid (p-Nithbenzoic Acid, PNBA), yellow-white crystal, is a raw material for strong fibers, medicines, dyes, and photosensitive materials, and is used to produce procaine hydrochloride, procainamine hydrochloride, and p-Nitrobenzoic acid. Aminobenzoic acid, folic acid, benzocaine, cephalosporin V, p-aminobenzoyl glutamic acid, Bernier, reactive brilliant red M-8B, reactive red purple X-2R and filter, color film agent, metal surface rust inhibitor, sunscreen agent, etc.; can also manufacture strong fibers, pesticides, medicines, dyes, resins, metal surface rust inhibitors, sunscreen agents, color film couplers and filters, etc. The market demand is large. [0003] The traditional preparation method of p-nitrobenzoic acid is to ...

Claims

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Application Information

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IPC IPC(8): C07C205/57C07C201/08
Inventor 王浩绮韦萍阮文辉周治王桂兰曹飞李霜刘超
Owner NANJING UNIV OF TECH
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