Molecular Sieve Co. Shanghai new reduced air rather than using chemical preservatives in food packaging method, has proven to be another way to extend the life of the food, almost every type of snack food products can be used with nitrogen including Ma Ling fried potato chips, meat, fresh fruit slices 4a molecular sieve, vegetables, nuts, crackers and cookies 4a molecular sieve recovery, using very dry nitrogen in food packaging is to remove moisture problem 4a molecular sieve material, reduce oxygen content can be reduced food oxidation and fading. Shanghai has a new molecular sieve Ltd. Keywords: eutectic; molecular sieve; DME; carbonylation; methyl acetate CLC: TQ426.61, TQ225.24 + 1 Document code: A DOI: 10.3969 / j.issn .1006-6829.2013.03.005 in the synthesis of molecular sieves, the same reaction system often generates a variety of crystals, which is mixed crystal zeolite synthesis, symbiosis or eutectic phenomenon. 2-phase co-crystallized zeolite allows its catalytic reaction in the course of the reaction molecules more accessible to the active site, significantly improve the catalytic reaction rate controlled by diffusion, product selectivity, as well as resistant to deactivation more carbon pores is removed by baking, etc. Features, 4a zeolite acidity, 4a zeolite molecular sieves by new Shanghai there are new molecular sieve Limited. Shanghai new molecular sieve Limited (www.molsionms.com) strong, credible, in Shanghai's Songjiang District elemental industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the new molecular sieves, and you hand in hand into the brilliant, for a better future!