Preparation and Research Advance of Electronic Grade Phosphoric Acid

2014 ◽  
Vol 881-883 ◽  
pp. 70-73
Author(s):  
Bin Wang ◽  
Kang Bi Luo
Keyword(s):  
Phosphoric Acid ◽  
High Purity ◽  
Industrial Production ◽  
Direct Method ◽  
Purification Method ◽  
Oxidation Method ◽  
Advantages And Disadvantages ◽  
Yellow Phosphorus ◽  
Research Advance

The application of high purity phosphoric acid in industrial production is more and more widely used, especially electronic grade phosphoric acid, and the demand of it has risen year by year. This paper introduces the preparation and research advance of electronic grade phosphoric acid, expounds the principle, advantages and disadvantages and research advance of preparing high purity phosphoric acid by high purity phosphorus oxidation method and phosphoric acid purification method. Using hot process by direct method to prepare high purity electronic grade phosphoric acid is still the mainstream on the current, and the key of technique is the purification of yellow phosphorus and phosphoric acid.

scholarly journals Dihydronicotinamide riboside: synthesis from nicotinamide riboside chloride, purification and stability studies

RSC Advances ◽  
2021 ◽  
Vol 11 (34) ◽  
pp. 21036-21047
Author(s):  
Amin Zarei ◽  
Leila Khazdooz ◽  
Mojtaba Enayati ◽  
Sara Madarshahian ◽  
Timothy J. Wooster ◽  
...  
Keyword(s):  
High Purity ◽  
Stability Studies ◽  
Purification Method ◽  
Nicotinamide Riboside

A convenient and scalable method for synthesis of dihydronicotinamide riboside (NRH) from the commercially available nicotinamide riboside chloride (NRCl) is elaborated as well as a fast purification method that led to high purity NRH.

Next generation purification method for achieving low trace metals in ultra-high purity chemicals

2021 ◽  
Author(s):  
Majid Entezarian ◽  
Mitsuaki Kobayashi ◽  
Yukihisa Okada ◽  
Takaaki Shirai ◽  
Keita Abe ◽  
...  
Keyword(s):  
Trace Metals ◽  
High Purity ◽  
Next Generation ◽  
Purification Method ◽  
Ultra High Purity

scholarly journals Method development for producing thin 14C foils

2020 ◽  
Vol 229 ◽  
pp. 04002
Author(s):  
Matthew Gott ◽  
John Greene ◽  
Igor Pavlovsky ◽  
Richard Fink
Keyword(s):  
High Purity ◽  
Nuclear Physics ◽  
Method Development ◽  
Carbon Oxide ◽  
Carbon Powder ◽  
Robust Method ◽  
Purification Method ◽  
Physics Community ◽  
Thin Foils

Thin, isotopic 14C foils are of great interest to the nuclear physics community as neutron-rich targets. Historically, these foils have been extremely difficult to prepare and an effort is underway to make them readily available. The stock material of 14C available at Argonne contains a number of oxide impurities (SiO2, MgO, and Al2O3), which affect the composition and stability of the fabricated foil. A simple, robust method was developed (using natC as a surrogate) to purify the 14C material while minimizing loss and potential spread of the material. Thin foils were fabricated using the purified carbon, the unpurified carbon/oxide mix, and purchased high-purity carbon powder. SEM and EDS of the resulting foils was performed and the efficacy of this purification method was demonstrated.

scholarly journals AVA Biochem, Pioneer in Industrial Biobased Furan Chemistry

2020 ◽  
Vol 74 (10) ◽  
pp. 776-778
Author(s):  
Stefan Krawielitzki
Keyword(s):  
High Purity ◽  
Industrial Production ◽  
Industrial Scale ◽  
Technical Grade ◽  
Food Industries ◽  
Platform Chemical ◽  
Grade 5 ◽  
Global Leader ◽  
Specialty Chemicals ◽  
Bulk Chemistry

Swiss-based AVA Biochem AG is the global leader in the industrial production and sale of the bio-based platform chemical 5-hydroxymethylfurfural (5-HMF), a renewable and non-toxic alternative to a range of petroleum-based materials. 5-HMF has a broad range of applications in the chemical, pharmaceutical and food industries. Since 2014 AVA Biochem has been producing high-purity 5-HMF for research purposes and specialty chemicals markets, as well as technical-grade 5-HMF for bulk chemistry applications. AVA Biochem's own R&D department also develops the downstream chemistry of 5-HMF and thus opens the door to biobased furan chemistry on an industrial scale.

scholarly journals Scalable Synthesis of High-Purity (R, R)-Dexmethylphenidate Free Base

2016 ◽  
Vol 8 (4) ◽  
pp. 28 ◽  
Author(s):  
Guan Wang ◽  
Dongsheng Chen ◽  
Yuanyuan Sun ◽  
Qing Cao ◽  
Bonan Li ◽  
...  
Keyword(s):  
Amino Acid ◽  
High Purity ◽  
Industrial Production ◽  
Acid Ester ◽  
Substitution Reaction ◽  
Practical Method ◽  
Amino Acid Ester ◽  
Free Base ◽  
Hydrochloride Salt ◽  
Scalable Synthesis

<p>A practical method for the preparation of high-purity (<em>R, R</em>)-dexmethylphenidate free base was developed. The method involves a substitution reaction of 2-chloropyridine and phenylacetonitrile via hydrolysis followed by hydrogenation, configuration inversion, chiral resolution, methyl esterification, and salification to give high-purity dexmethylphenidate hydrochloride. The hydrochloride salt was then neutralized by powder sodium hydroxide overnight to give dexmethylphenidate free base with over 99% purity. This method can be used for the industrial production of the dexmethylphenidate patch API, which could also be further applied for the preparation of other types of amino acid ester free bases.</p>

scholarly journals Industrial Production Method of High Purity Dialkylphosphate

1990 ◽  
Vol 39 (5) ◽  
pp. 346-350
Author(s):  
Tomihiro KUROSAKI ◽  
Norio NISHIGAWA ◽  
Akira MATSUNAGA
Keyword(s):  
High Purity ◽  
Industrial Production ◽  
Production Method

scholarly journals Purification Method for Achieving Low Trace Metals in Ultra-High Purity Chemicals

2021 ◽  
Vol 34 (2) ◽  
pp. 205-211
Author(s):  
Mitsuaki Kobayashi ◽  
Yukihisa Okada ◽  
Takaaki Shirai ◽  
Osamu Sawajiri ◽  
Robert Gieger ◽  
...  
Keyword(s):  
Trace Metals ◽  
High Purity ◽  
Purification Method ◽  
Ultra High Purity
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