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Study on the acidity of printing and dyeing wastewater

Established in 2001, Puyang Zhong Yuan Restar Petroleum Equipment Co.,Ltd, “RSD” for short, is Henan’s high-tech enterprise with intellectual property advantages and independent legal person qualification. With registered capital of RMB 50 million, the Company has two subsidiaries-Henan Restar Separation Equipment Technology Co., Ltd We are mainly specialized in R&D, production and service of various intelligent separation and control systems in oil&gas drilling,engineering environmental protection and mining industries.We always take the lead in Chinese market shares of drilling fluid shale shaker for many years. Our products have been exported more than 20 countries and always extensively praised by customers. We are Class I network supplier of Sinopec,CNPC and CNOOC and registered supplier of ONGC, OIL India,KOC. High quality and international standard products make us gain many Large-scale drilling fluids recycling systems for Saudi Aramco and Gazprom projects.

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Study on the acidity of printing and dyeing wastewater
Practical and Sustainable Modification Method on Activated ...
Practical and Sustainable Modification Method on Activated ...

In a 100 mL flask, the crude APAP (13.8 g) were dissolved in ultrapure water (16.9 mL) under a nitrogen flow at 80 °C. Then, 3.67 g of activated carbon solution (27.2 wt %, the solvent was ultrapure water or 2 g/L ,sodium pyrosulfite, aqueous solution) was added to the crude APAP solution and heated up to 100 °C.

CN101811998A - Preparation method of 1-amino-2-naphthol-4 ...
CN101811998A - Preparation method of 1-amino-2-naphthol-4 ...

Measure 34% the about 28g of concentrated hydrochloric ,acid,, slowly be added dropwise to (about 20 minutes) in the four-hole bottle, make beta naphthal be fine particle and separate out, to obtain meticulous crystalline beta naphthal particle.,Acid, out terminal point pH=6, about 10 ℃ of temperature.

US6060621A - Process for the preparation of ...
US6060621A - Process for the preparation of ...

If the pH value decreases below 6.0, a 20% solution of sodium sulfite is added, dropwise, until the pH value exceeds a value of 7.0. Thereafter, 450 g of concentrated H2SO4are added to the reaction...

Recovery of copper tin and lead from the spent nitric ...
Recovery of copper tin and lead from the spent nitric ...

1/7/2003, · In order to suppress the oxidizing properties of nitric acid solution, sodium pyrosulfite was added to the nitric acid solution (Stefanowicz et al., 1997). Reduction reaction of nitric acid to nitrogen oxide by sodium pyrosulfite is represented in Eq. (2). (2), 4 HNO 3 + Na 2 S 2 O 5 =2 NaHSO 4 +4 NO 2 + H 2 O

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