179 results about "M-Xylene" patented technology

This invention relates to a biocatalytic process to produce terephthalic acid and isophthalic acid from p-xylene and m-xylene, respectively. Terephthalic acid has been prepared by oxidizing p-xylene with bacteria belonging to the genus Burkholderia. Conversion of p-xylene into terephthalic acid is accomplished by a single bacterial strain that produces all of the requisite enzymes. In addition, this invention relates to the preparation of isophthalic acid from a mixture of m- and p-xylene.

The invention relates to a high-silicon MFI zeolite adsorbent without adhesive and a preparation method thereof, which mainly aim at solving the problems of small adsorption capacity of an adsorbent for PX in mixed xylene C8, as well as low adsorption rate and poor separation effect in the prior art. The high-silicon zeolite adsorbent without adhesive is prepared through the steps of adding high-silicon MFI powder in specific grain size distribution into a silicon adhesive for forming and performing crystal transformation, wherein the grain size of the adsorbent is 16-40 meshes; at room temperature, when a solid-liquid ratio is 3 to 5, the adsorption capacity of per gram of adsorbent for p-xylene in a 1,3,5-trimethylbenzene solution containing 10% of p-xylene based on weight percent is greater than 0.102g, the selectivity coefficient of p-xylene for ethylbenzene, o-xylene and m-xylene is higher than 9.0, and within initial three minutes, the adsorption rate of the per gram of adsorbent for p-xylene is greater than 22mg / minute. By virtue of the technical scheme, the technical problems are well solved and the high-silicon MFI zeolite adsorbent without adhesive can be used for separation of p-xylene in C8 arene.

A decorative film having an outer layer containing a polyamide composition with the following components: a) from 50 to 100 parts by weight of polyamide prepared from: alpha) from 70 to 100 mol % of diamine selected from m-xylylenediamine, p-xylylenediamine and mixtures thereof, beta) from 0 to 30 mol % of other diamines having from 6 to 14 carbon atoms, and gamma) from 70 to 100 mol % of aliphatic dicarboxylic acids having from 10 to 18 carbon atoms and delta) from 0 to 30 mol % of other dicarboxylic acids having from 6 to 9 carbon atoms, and b) from 0 to 50 parts by weight of another polyamide, where a) and b) total 100, having good chemicals resistance, good stress cracking resistance, improved scratch resistance, and improved gloss. Typical application are vehicle manufacture and use as surface lacquer of ski and sled.

The invention discloses a GC-MS method for measuring volatile characteristic organic matters in water based on multifunctional on-line sample introduction. According to the method, two kinds of onlinepretreatment methods of headspace and dynamic headspace of benzene series (benzene, methylbenzene, ethylbenzene, p-xylene, m-xylene, o-xylene, isopropyl benzene, chlorobenzene and styrene) are established; two kinds of online pretreatment methods of a solid-phase micro-extraction method and a magnetic stirring adsorption extraction method of two kinds of odor substances (geosmin and dimethyl isocamphitol), and four kinds of a formula which is as shown in the specification are established; and then online sample introduction GC-MS detection is carried out. The detection result shows that the detection limit, the recovery rate, the precision and the like of the on-line method for detecting the volatile organic matters in the three categories can meet the measurement requirements; the onlinedetermination efficiency is improved by one half to two thirds, and the method is simple, convenient, environment-friendly and efficient. According to the method, the sample detection sensitivity iseffectively improved by adding the aid and a secondary adsorption mode, and meanwhile, the traditional thermal desorption sample introduction mode is changed, and the accuracy and operability of sample detection are both optimized.

Biaxially oriented polyester films which have a polyester-containing base layer (B) and at least one overlayer (A) which comprises poly(m-xyleneadipamide) (MXD6) feature improved optical properties such as increased gloss and very good barrier properties, in particular toward passage of oxygen, and are therefore suitable as packaging materials for foods and other consumable items.