E.i. Dupont De Nemours and Company

Madhusudan D Jayawant

Paul C Yates

Geoffrey Walsh Meadows

An improved process for delignifying and bleaching nonwoody, lignocellulosic material into products digestible by ruminants and ingestible by humans. The process comprises treating the substrate in an alkaline solution for a period of time and adding magnesium ions prior to adding peroxide or, alternatively, adding the magnesium to the peroxide prior to adding the peroxide to the alkaline slurry.

Magnesium ions in a process for alkaline peroxide treatment of nonwoody

The present invention relates to a process for destroying polynitrophenols or their salts in an aqueous waste by treating with at least two moles of hydrogen peroxide per mole of polynitrophenol in the presence of from 0.002 to 0.7 moles of an iron salt per mole of polynitrophenol. The destruction takes place at a pH lower than 4 and a temperature greater than 65.degree. C.

Destruction of nitrophenols

A storage stable salt melting at 80.degree. to 150.degree. C. having the formula (KHSO.sub.5).sub.x (KHSO.sub.4).sub.y (K.sub.2 SO.sub.4).sub.z where x+y+z=1, and x=0.4-0.97, preferably 0.60-0.85; y=0.03-0.60, preferably 0.15-0.40; z=0-0.10, preferably 0-0.3; and y is .gtoreq.z, which is treated with 1.0-9.0% of a basic magnesium compound which is MgCO.sub.3, Mg(OH).sub.2, MgO or mixtures thereof is disclosed. The salt is prepared by neutralizing Caro's acid with a basic potassium compound to form a reaction mixture. Water is evaporated from the reaction mixture at 15.degree. to 35.degree. C. using a vacuum of 2-15 mm Hg absolute pressure to form up to 40 wt. % crystals. The crystals are separated, treated with a basic magnesium compound, dried, and further treated with a basic magnesium compound.

Potassium monopersulfate compositions and process for preparing them

Heavy metal ions bonded to complexing agent can be precipitated from waste streams with a combination of a magnesium ion, calcium hydroxide and peroxygen compound.

Removal of heavy metal ions

A process for preparing very high purity anhydrous hydrogen fluoride by contacting anhydrous hydrogen fluoride with at least 2.3% by weight of persulfuric acid based on the anhydrous hydrogen fluoride or at least 0.7% by weight of hydrogen peroxide based on the anhydrous hydrogen fluoride at ambient temperature and either at least 0.6% by weight of methanol based on the anhydrous hydrogen fluoride or at least one mole of sulfuric acid per mole of hydrogen peroxide at a temperature of from 0.degree. to 75.degree. C and distilling the resulting mixture to recover very high purity anhydrous hydrogen fluoride.

Purification of anhydrous hydrogen fluoride

Spheroidal aggregates of highly absorbent, low bulk density, readily soluble, high surface area, hydrated, amorphous alkali metal silicate are provided by contacting discrete alkali metal silicate particles with an aqueous solution of hydrogen peroxide, absorbing the peroxide into the alkali metal silicate hydrated structure and heating the silicate to destroy substantially all of the hydrogen peroxide. CROSS REFERENCE TO RELATED APPLICATION

Highly absorbent, low bulk density sodium silicate

Sodium percarbonate of improved storage stability in solid bleach and detergent formulations is made by contacting the sodium percarbonate particles with an aqueous sol containing 3 to 8 percent W/V (gm./100 cc.) of silica which has a maximum particle size of 0.1 micron and which is prepared by deionizing a solution of a water soluble silicate to a pH of 3 to 10, in order to deposit on the percarbonate particles from 1 to 10 percent by weight of silica based on the weight of the percarbonate.

Silica sol stabilizers for improving the stability of sodium

Spheroidal aggregates of highly absorbent, low bulk density, readily soluble, high surface area, hydrated, amorphous alkali metal silicate are provided by contacting discrete alkali metal silicate particles with an aqueous solution of hydrogen peroxide, absorbing the peroxide into the alkali metal silicate hydrated structure and heating the silicate to destroy substantially all of the hydrogen peroxide.

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Hockessin, DE, United States of America

Madhusudan D Jayawant