31 results about "Polyethylene glycol product" patented technology

The present disclosure relates to methods for converting light glycol streams of biological origin into products suitable for use as oxygenated fuel additives. These methods involve the acidic condensation of light glycols to form larger products, termed low molecular weight poly-glycols. The remaining hydroxyl functional groups of the poly-glycol products are then modified to decrease the overall polarity of the products, and improve their suitability for use as an oxygenated fuel additive.

A process for preparing and separating a monodisperse polyethylene glycol, including: dissolving a starting material of polyethylene glycol into an organic solvent for reaction with a compound represented by general formula I under catalytic action of an alkaline substance, to prepare a mixture of derivatives of polyethylene glycol having different polarities; separating the mixture of derivatives of polyethylene glycol by means of silica gel column chromatography, to obtain a monodisperse derivative of polyethylene glycol; and hydrolyzing the derivative of polyethylene glycol to obtain a monodisperse polyethylene glycol. The starting material is industrially prepared polyethylene glycol with a wide source and low cost, which provides a guarantee for popularization and application of a monodisperse polyethylene glycol product.

The invention provides a pharmaceutical composition for relaxing bowels and purging intestines, wherein the pharmaceutical composition comprises polyethylene glycol with a molecular weight distribution of 3,300-3,800. As polyethylene glycol with the molecular weight distribution of 3,300-3,800 is contained, the pharmaceutical composition for relaxing bowels and purging intestines provided by the invention not only has better effects of relaxing bowels and purging intestines than those of the existing medicines containing polyethylene glycol with a molecular weight of 4,000 and polyethylene glycol with a molecular weight of 3,350, but also has the advantages of good taste and few side effects of bowels relaxing and intestines purging, so that the pharmaceutical composition is more helpful for the clinical treatment of the constipation and the preparation of cleaning the intestines before an operation. The invention also provides a preparation method of the pharmaceutical composition. By adopting the preparation method, the molecular weight distribution of polyethylene glycol which is the major ingredient of the pharmaceutical composition can be accurately controlled in a range of 3,300-3,800.

The invention discloses a silicon wafer-cutting waste slurry recovery method, which adopts a physical treatment process. The silicon wafer-cutting waste slurry recovery method includes the following steps of: (step 1) pretreatment: solid-liquid separation is carried out; (step 2) recovery of polyethylene glycol on a liquid line: the filtrate obtained by separation in the first step undergoes particle-removing pressing, decoloration, ion exchange, four-effect distillation and cooling, so that the finished polyethylene glycol product is obtained; and (step 3) recovery of silicon carbide on a solid line: the filter cake obtained in the first step undergoes primary filter pressing, secondary filter pressing, drying and impurity separation by a separator, so that the finished silicon carbide product is obtained. The silicon wafer-cutting waste slurry recovery method not only has the advantages of large separation capacity, high recovery rate and good quality of recovered polyethylene glycol and silicon carbide, but also realizes environment-friendliness and zero-pollution treatment, and also reduces the production cost.

The invention discloses a process for treating chlorinated organic compounds by polyethylene glycol and alkaline substances. Wastes containing chlorinated organic pollutants are added into a reactor, the polyethylene glycol and the alkaline substances are sequentially added into the reactor, and dechlorination degradation reaction can be achieved. The process has the advantages that the reaction time is short, the reaction temperature is low and the reaction materials are easy to obtain.

The invention discloses a waste silicon wafer-cutting fluid processing method and a silicon carbide rinsing device. The processing method includes the following steps that: (A) water is added to dilute waste silicon wafer-cutting fluid and mixed, and a magnet is used for attracting iron; (B) flocculant is added, and solid and liquid are separated; (C) water is added to dilute the solid, and the silicon carbide suspension is added with sodium hydroxide, heated for reaction, washed by water, added with acid and washed until the pH value reaches 6.5 to 7, so that a crude silicon carbide product is obtained; (D) the crude product is separated, and after drying, a finished silicon carbide product is obtained; (E) the liquid is filtered, and after dehydration, a finished polyethylene glycol product is obtained. The scheme increases the purity of the sodium carbide, and reduces the consumption of acid and alkaline. The silicon carbide rinsing device comprises a rinsing bucket, the sidewall of the rinsing bucket is provided with a plurality of decanting outlets, the end of the rinsing bucket is provided with a water inlet tube, and a water distributor is arranged in the cone; the wall of the rinsing bucket is also provided with an air inlet, and an air tube is arranged in the bucket, and is provided with a plurality of microporous air distributors. The device can prevent the sediment of silicon carbide, thus enhancing the rinsing effect.