查询词典 formaldehyde

Over a solid acid catalyst, the reaction in which methanol and formaldehyde are condensed into mathylal is reversible. This reaction tends to be completion by reactive distillation and the high-purity methylal product can be obtained.

在固体酸催化剂作用下，由甲醇、甲醛缩合生成甲缩醛，该反应为可逆反应，采用催化精馏技术可使反应趋于完全，并得到高纯度甲缩醛产品。

The experiment results indicate that: the increases of catalyst concentration, feed mole ratio of methanol to formaldehyde and the decrease of total feed flow can increase the yield of methylal; the concentration of methylal in distillate also increases with the increase of catalyst concentration; that the effects of reflux ratio on the yield and concentration of methylal in distillate are different from conventional distillation process, an optimal value of reflux ratio exists between 1 and 2 for this process.

实验结果表明：回流比对甲缩醛收率和塔顶甲缩醛纯度的影响不同于一般的精馏过程，存在一个最优回流比，本过程最佳回流比在1-2之间；提高催化剂浓度，甲缩醛收率和塔顶甲缩醛纯度均增加；提高进料醇醛摩尔比也会提高甲缩醛收率；进料总流量对甲缩醛的收率的影响十分明显，进料总流量减少可以使甲缩醛的收率得到明显提高。

Several kinds of important downstream products of methanol are introduced,such as formaldehyde,methylformate,methylamine,and so on.

介绍了甲醇的几种重要的下游产品，如甲醛、甲酸甲酯、甲胺等，提出应大力生产和发展甲醇下游产品，并进一步拓宽甲醇的应用领域，加快甲醇应用新技术的开发工作。

In rabbit plasma, there are two kinds of SSAO which can catalyze methylamine into formaldehyde and have significantly different kinetic parameters.

兔血浆含有两种SSAO酶组分，均可以催化甲胺氧化脱氨生成甲醛；组分A、B动力学特征有所不同。

Statistical analysis was done for the rate of bone marrow cell micronucleus induced by different dose of formaldehyde.

对不同浓度气态甲醛诱导昆明种小鼠骨髓嗜多染红细胞微核率进行了统计分析。

Objective To explore the effect of formaldehyde on differentiation and proliferation of limb bud and midbrain cells in mouse embryos.

目的 探讨甲醛对小鼠胚胎肢芽和中脑细胞分化、增殖的影响。

Durable formaldehyde-free phosphorus flame retardant for cotton,FRC-F,was synthesized with dimethyl methylphosphonate,phosphoric pentaoxide and ethylene glycol-glycerol mixt.

利用甲基膦酸二甲酯、五氧化二磷、乙二醇、丙三醇的混合物成功地合成了一种无甲醛棉用耐久性膦系阻燃剂，探讨了阻燃剂FRC-F、多元羧酸交联剂BTCA、催化剂NaH2PO2、柔软剂等应用于棉织物的工艺。研究结果表明：阻燃剂FRC-F是一种值得研究和开发的无甲醛棉用阻燃剂

Methods The effect of factors such as reaction temperature, pH, formaldehyde-urea moleratio, contents of PVA and melamine upon the viscosity of the MUF resin, stability, water resistance and the quality of MUF resin.

方法反应温度、pH值、甲醛尿素摩尔比、PVA的用量、三聚氰胺的用量等对脲醛树脂胶液的粘度、稳定性、耐水性、胶合质量的影响。

The MUF which deal with ammonia can has low emission of free-formaldehyde, but the adhesive strength decrease.

用氨水后期处理制得的三聚氰胺改性脲醛树脂胶粘剂，游离甲醛含量明显减少，但是影响胶粘剂的胶合强度

And in this resin most of the phenol was free, that was to say it didn't co-condense with UF species, MF species, and even formaldehyde. So the method to add phenol to MUF resin in the end of the preparation of MUF resin couldn't guarantee the co-condensation between MUF resin and phenol to come forth.

另外，几乎所有的苯酚在树脂中也都处于游离状态，它既未与UF树脂或MF树脂发生反应，也未与游离甲醛发生反应，因此，在树脂合成后期向树脂中加入苯酚的方法不能保证共缩聚反应的发生。

We stopped by the old fashion ice cream parlor Manhattan Beach Creamery for some refreshment. The "No Shoes, No Shirt, No Problem" sign on the wall epitomizes the beach lifestyle.

我们去商店区的一家老式冰淇淋店坐坐，墙上挂著「没鞋，没上衣，没问题」的牌子完全捕捉了海滩生活的随性及风格。

"If therefore", argues Bellarmine we can offer our prayers and our satisfactions in behalf of those detained in purgatory, because we are members of the great body of Christ, why may not the Vicar of Christ apply to the same souls the superabundant satisfaction of Christ and his saints--of which he is the dispenser?

" "因此，如果"，认为贝拉明（德indulgentiis ，十四）"我们可以提供我们的祈祷和我们满意的代表那些被拘留在炼狱，因为我们是成员的伟大基督的奥体，为什麼可能不是牧师基督适用於同样的灵魂满意的过剩是耶稣和他的圣人-他是在配药？