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Titanium dioxide can no longer be considered safe when used as an additive in animal feed, EFSA has concluded. Image. Glyphosate: EU regulators begin review of renewal assessments. EFSA and the European Chemicals Agency have received a draft
Chloride in water may be considerably increased by treatment processes in which chlorine or chloride is used. For example, treatment with 40 g of chlorine per m3 and 0.6 mol of iron chloride per litre, required for the purification of
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Pulp & Paper. Paper, a sustainable natural product based on renewable raw materials, has a bright future in a wide variety of applications and end uses. Global megatrends, such as urbanization, digitalization and growing middle class are
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- What is an anionic polyacrylamide?
- Anionic polyacrylamides make up the largest portion of the polyacrylamide market. The polymers can be prepared over a wide range of anionic charges and molecular weights (1000 to > 20,000,000 molecular weight). The workhorse comonomer for the production of anionic polyacrylamides is acrylate salts of acrylic acid.
- Which cationic polyacrylamide has a charge density of 40%?
- Three commercial cationic (PAM +S,τ40 ), nonionic (PAM °S) and anionic (PAM −S,τ40) polyacrylamides (PAMs) with a medium chain length produced by the SNF group (Andrézieux, France) were used ( Table 1 ). PAM +S,τ40 and PAM −S,τ40 have a charge density of 40%.
- What type of polyacrylamide is used in oil industry?
- The polyacrylamide use can be anionic, cationic, or nonionic with various ratios of the comonomers used in the case of the anionic and cationic polymers. The anionic polyacrylamides in the oil field industry are designated by the generic name of partially hydrolyzed polyacrylamide (PHPA), although they are in actuality copolymers .
- Can nonionic polyacrylamide be used as a gel fracturing fluid?
- Nonionic polyacrylamide (NPAM) with controlled molecular weight was successfully synthesized as a gel fracturing fluid by aqueous solution polymerization.
