Oil superheater-based feeding system for phthalic anhydride production

Abstract

The invention discloses an oil superheater-based feeding system for phthalic anhydride production, which comprises a tubular reactor, a feeding pipe is arranged on the outer surface of the upper end of the tubular reactor, an air pipe is arranged on the outer surface of one side of the feeding pipe, a crude benzene storage bin is arranged on the outer surface of one side of the tubular reactor, an oil superheater is arranged on the outer surface of the upper end of the crude benzene storage bin, and a steam generator is arranged on the outer surface of the other side of the crude benzene storage bin. A first distillation tower is arranged on the outer surface of the other side of the steam generator, a waste gas filtering mechanism is arranged on the outer surface of the upper end of the first distillation tower, and a connecting pipe is arranged on the outer surface of the other side of the first distillation tower. The feeding system for phthalic anhydride production based on the oil superheater has the advantages that the safety is improved while phthalic anhydride production is facilitated, meanwhile, waste gas is prevented from being directly discharged, pollution is avoided, and better use prospects are brought.

Description

technical field [0001] The invention relates to the field of phthalic anhydride, in particular to a feed system based on an oil superheater for the production of phthalic anhydride. Background technique [0002] Phthalic anhydride, the full name of phthalic anhydride, as an important organic chemical raw material, is mainly used in the production of phthalic plasticizers, unsaturated polyester resins, alkyd resins, etc., and is widely used in plastics, coatings, synthetic materials, etc. In other fields, a small amount is used in the production of dyes, pharmaceuticals, pesticide intermediates and saccharin. Among them, 95% of the total amount of plasticizers (80% are phthalic plasticizers) are used for the processing of polyvinyl chloride (PVC) plastics, and the dominant position of phthalic plasticizers is difficult to shake. Due to the good plasticity and excellent performance of plastic products, they have already become substitutes for wood, cotton, etc., and the marke...

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Problems solved by technology

The traditional naphthalene process (fluidized bed) has high unit consumption of raw materials, low phthalic anhydride yield, unstable product quality, and pollution; the ortho-phthalic anhydride process has stable production, high yield, clean and environmentally friendly, and product quality is guaranteed, but , in recent years, due to the tight supply of raw material o-benzene, the price has been rising continuously, and the price of product raw materials has been inverted. , so that the temperature of naphthalene gas cannot be raised, resulting in a lack of safety

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