Treatment and resource-reclaiming process for waste water from production of dimethyl isophthalate-5-sulfonic acid

Abstract

The invention discloses a father and resource method about m-phthalic acid dimethyl ester-5-sulfonic acid produced waste-water.the steps is passing the m-phthalic acid dimethyl ester-5-sulfonic acid produced waste-water of filter preconditioning to adsorbing column loaded acrylate adsorbing resin; after adding alkali in adsorbing water for neutralization, distillation recovery by carbinol and adsorption handling by activated carbon, and then can be discharged; the acrylate adsorbing resin which is adsorbed the organic matter of m-phthalic acid dimethyl ester-5-sulfonic acid produced waste-water can be desorbed by hot water, the desorption liquid can recover the m-phthalic acid dimethyl ester-5-sulfonic acid crystal by evaporation, condensation and crystallization. The CODCr in disposal waste-water of the open method of this invention is fell from 180000mg / L to about 100mg / L, the m-phthalic acid dimethyl ester-5-sulfonic in waste-water can be recovered as product, the purity can reach to primary standard; not only saving the raw material, but also avoiding secondary pollution. The final discharged waste-water accord with national sewage discharge standard, hasing distinct environmental, economic and social benefit.

Description

1. Technical field

[0001] The present invention relates to a treatment and recycling method of waste water from the production of dimethyl isophthalate-5-sulfonic acid. Production wastewater adsorption and desorption method. 2. Background technology

[0002] The trade name of dimethyl isophthalate-5-sulfonic acid is SIPM. This product can be used as the third monomer in the production of cationic dyeable polyester by DMT method, commonly known as tri-monomer. The production of dimethyl isophthalate-5-sodium sulfonate generally adopts the "one-pot method", that is, after directly sulfonating isophthalic acid, esterification with methanol, and then reacting with alkali to obtain dimethyl isophthalate Sodium ester-5-sulfonate. Using this production process, about 7 tons of strong acid wastewater will be produced per ton of product. The wastewater is light yellow and has a CODcr of about 180,000 mg / L, mainly containing methanol (CODcr is about 80,000 mg / L) and dimethyl isopht...