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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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Tax preference for fracturing flowback fluid
Salt Free Dyeing of Cotton Fabric with Reactive Dyes ...
Salt Free Dyeing of Cotton Fabric with Reactive Dyes ...

a. Standard potassium dichromate solution, 0.25N (0.04167 M): Dissolve 12.259g K2Cr2O7 dried at 103°C for 24h in distilled water and dilute to 1000mL. Add about 120mg sulphamic ,acid, to take care of 6 mg/L NO2 – N. b. Sulphuric ,acid, reagent: Add 10g of Ag2SO4 to 1000mL concentrated H2SO4 and let stand for one to two days for complete dissolution.

Best Ultimate AP Chem Review Flashcards | Quizlet
Best Ultimate AP Chem Review Flashcards | Quizlet

Ag+ (aq) + e- -> Ag (s) E° = +0.80V. Cu2+ (aq) + 2e- -> Cu (s) E° = +0.34V. True or false: There is a net general movement of silver ions through the salt bridge to the copper half-cell. false. What is the oxidation state of Cr in ,Cr2O7,-2. +6. For a reaction in a voltaic cell both ΔH° and ΔS° are positive.

Removal of chromium (VI) using activated carbon-supported ...
Removal of chromium (VI) using activated carbon-supported ...

The chromic ,acid, predominates at pH values less than about 1.0, HCrO4- at pH range of 1.0-6.0, Cr2O72- and CrO42- at pH values above 6.0. For AC, more adsorption at acidic pH indicates that lower pH results in an increase in H? ions on the adsorbent surface that results in significantly strong electrostatic attraction between positively charged adsorbent surface and chromium ions.

Chemistry Archive | March 12 2017 | Chegg.com
Chemistry Archive | March 12 2017 | Chegg.com

Draw a rational mechanism for the ,acid,-catalyzed formation of the hemiacetal that results from the reaction of cyclohexanone with ethanol in the presence of ... Assume that a ,wastewater, contains phenol (C_6H_6O) ... Titration of 50 ml of 0.1M Fe^2+ in 1M HClO4 with 0.0167M ,Cr2O7,^2- E°Fe= 0.762V and E°Cr= 1.33V a) Write the balanced ...

REMOVAL OF HEXAVALENT CHROMIUM FROM SYNTHETIC WASTE WATER ...
REMOVAL OF HEXAVALENT CHROMIUM FROM SYNTHETIC WASTE WATER ...

Chromium (Cr), which is one of the most toxic and important heavy metals usually found in ,wastewater, due to industrial activities of tanning and electroplating industries[7].In nature, chromium occurs either as Cr(VI) or as Cr(III)[8-9].In aqueous solution it most commonly is formed as Cr (VI) or Cr (III) [10-11].These two oxidation states are drastically different in charge, physicochemical properties as well as chemical …

Chemistry Archive | March 12 2017 | Chegg.com
Chemistry Archive | March 12 2017 | Chegg.com

Draw a rational mechanism for the ,acid,-catalyzed formation of the hemiacetal that results from the reaction of cyclohexanone with ethanol in the presence of ... Assume that a ,wastewater, contains phenol (C_6H_6O) ... Titration of 50 ml of 0.1M Fe^2+ in 1M HClO4 with 0.0167M ,Cr2O7,^2- E°Fe= 0.762V and E°Cr= 1.33V a) Write the balanced ...

Methods for Chemical Analysis of Water and Wastes
Methods for Chemical Analysis of Water and Wastes

----- water, 1 1 hydrochloric ,acid,, tap water and finally deionized distilled water in that order NOTE 1: Chromic ,acid, may be useful to remove organic deposits from glassware, however, the analyst should be cautioned that the glassware must be thoroughly rinsed with water to remove the last traces of chromium This is especially important if chromium is to be included in the analytical scheme A commercial …

Salt Free Dyeing of Cotton Fabric with Reactive Dyes ...
Salt Free Dyeing of Cotton Fabric with Reactive Dyes ...

a. Standard potassium dichromate solution, 0.25N (0.04167 M): Dissolve 12.259g K2Cr2O7 dried at 103°C for 24h in distilled water and dilute to 1000mL. Add about 120mg sulphamic ,acid, to take care of 6 mg/L NO2 – N. b. Sulphuric ,acid, reagent: Add 10g of Ag2SO4 to 1000mL concentrated H2SO4 and let stand for one to two days for complete dissolution.

Diplom.de - Technical feasibility study on the chromium ...
Diplom.de - Technical feasibility study on the chromium ...

Theoretically, HCrO4- is the predominant species between pH 1.5 and 4.0, HCrO4- and CrO42- exist in equal amounts at pH 6.5, and CrO42- predominates at higher pH values. Chromium plating ,wastewater, is generally somewhat ,acid,, and the ,acid, chromate ion HCrO4- is predominant in this ,wastewater,.

Selective capture of hexavalent chromium from an anion ...
Selective capture of hexavalent chromium from an anion ...

This ion exchange process is described by the following equation: [Zr6O4(OH)4(NH3+-BDC)6]Cl6­HA + 3Cr2O72À / [Zr6O4(OH)4(NH3+-BDC)6](,Cr2O7,)3­HA + 6ClÀ Fig. 2 (1) Schematics for the preparation of the MOR-1­HA composite. EDS data revealed no ClÀ anions in …

Selective capture of hexavalent chromium from an anion ...
Selective capture of hexavalent chromium from an anion ...

This ion exchange process is described by the following equation: [Zr6O4(OH)4(NH3+-BDC)6]Cl6­HA + 3Cr2O72À / [Zr6O4(OH)4(NH3+-BDC)6](,Cr2O7,)3­HA + 6ClÀ Fig. 2 (1) Schematics for the preparation of the MOR-1­HA composite. EDS data revealed no ClÀ anions …

Chemistry Regurgitation notes Flashcards | Quizlet
Chemistry Regurgitation notes Flashcards | Quizlet

Neutralization reaction used in industry: ,Wastewater, from mines contains a lot of H2SO4 due to the decomposition and subsequent reactions of pyrite (FeS2) with water and oxygen in the air. This ,acid, can damage marine life downstream and also cause adverse effects on local plant life. 2FeS2(aq) + 4H2O(l) + 7O2(g) --> 2FeO(aq) + 4H2SO4(aq)

nh4i cation and anion - Habariclouds
nh4i cation and anion - Habariclouds

An ,acid,–base reaction is a type of chemical reaction that involves the exchange of one or more hydrogen ions, H +, between species that may be neutral (molecules, such as water, H 2 O) or electrically charged (ions, such as ammonium, NH 4 +; hydroxide, OH −; or carbonate, CO 3 2−).

Diplom.de - Technical feasibility study on the chromium ...
Diplom.de - Technical feasibility study on the chromium ...

Theoretically, HCrO4- is the predominant species between pH 1.5 and 4.0, HCrO4- and CrO42- exist in equal amounts at pH 6.5, and CrO42- predominates at higher pH values. Chromium plating ,wastewater, is generally somewhat ,acid,, and the ,acid, chromate ion HCrO4- is predominant in this ,wastewater,.

Removal of chromium (VI) using activated carbon-supported ...
Removal of chromium (VI) using activated carbon-supported ...

The chromic ,acid, predominates at pH values less than about 1.0, HCrO4- at pH range of 1.0-6.0, Cr2O72- and CrO42- at pH values above 6.0. For AC, more adsorption at acidic pH indicates that lower pH results in an increase in H? ions on the adsorbent surface that results in significantly strong electrostatic attraction between positively charged adsorbent surface and chromium ions.

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