甲醛

In the step of hydroxymethylation, gaseous formaldehyde, which was decomposed by paraformaldehyde, was conducted into the reactor. Orthogonal test was designed to investigate the factors of water content in material of PF, reaction temperature, reaction time and consumption of PF on the hydroxymethylation.

在羟甲基化反应中多聚甲醛的进料方式改进为气态进料法，通过正交实验，考察了多聚甲醛原料含水量、反应温度、反应时间、多聚甲醛用量对反应收率的影响。

In this paper,investigation has been made on the process for the synthesis of salicylaldehyde by esterification-oxidation with phenol,paraformaldehyde,boric acid as initial materials.

探索了以苯酚、硼酸和多聚甲醛为原料的酯化氧化法合成水杨醛的工艺路线，根据反应特点，改进了酯化反应方式，采用了多聚甲醛气态解聚法作为羟甲基化反应的进料方式，探讨了羟甲基化反应温度、多聚甲醛原料含水量、催化氧化反应催化剂用量对反应收率的影响并得到最佳反应条件，水杨醛收率为60.5%，纯度达98%以上。

Objective To understand the emission rate and the attenuation rule of formaldehyde in the artificial woodiness boards for sell in China and to study the efficiency of formaldehyde-eliminator.

目的了解目前市售木质人造板甲醛的释放量，研究不同板材甲醛的衰减规律以及甲醛消除剂的效果。

Kinds of Schiff base derivatives of 2-N-benzylidene Furanmethanamine have been designed. The Net Charges of main atoms, bond lengths, bond angles, dihedral angles, IR have been calculated by means of HyperChem6. 0 program. 36 kinds of Schiff base derivatives of benzylidene adenine have been designed. Also the net charges of main atoms, bond lengths, bond angles, dihedral angles, IR, the energy gap △E between HOMO and LUMO and the nonlinear second-order polarizability β have been calculated by means of HyperChem6. 0 program. The calculated results indicated that the nonlinear second-order polarizability β were up in accordance with the △E down.

设计了腺嘌呤缩苯甲醛36种衍生物，计算了这些分子的气相几何，腺嘌呤缩苯甲醛中各原子的电荷分布，最高占有轨道HOMO和最低未占有轨道LUMO的能量以及它们之间的能量差△E，同时还计算了这些分子的二阶非线性极化率β，我们发现腺嘌呤缩苯甲醛的二阶非线性光学系数与△E有近似一致的变化关系，随着△E的减小，二阶非线性光学系数有增大的趋势。

Main connections are methenyl ether linkage and methenyl. From the end of heat preservation to the end of whole reaction, main reaction was polycondensation. In general, there were three types reaction among melamine modified UF resin, urea-formaldehyde system, melamine-formaldehyde system and melamine-urea-formaldehyde system.

保温反应结束直到整个反应结束，缩聚反应为主要反应类型，三聚氰胺改性脲醛树脂中存在着3种反应体系：尿素甲醛的反应体系、三聚氰胺甲醛反应体系和三聚氰铵尿素甲醛共缩合反应体系。

Newly-decorated houses face serious phenomenon of formaldehyde concentration in Northest Normal Univercity above the values as specified in standards, 19 out of 30 datagroups actually measured exceed the national standards, approximately 63%.The highest group comes around 6 times the standard value, average equals to 1.8 times.

本论文在 2005年8月到2006年3月间，在东北师范大学校园建筑内选择室内甲醛监测点，并对室内人员进行相应调查，对30个室内环境中的甲醛浓度作了分析、采样与监测，对其中甲醛污染严重的室内环境进行了重点跟踪监测，并对监测和调查的结果进行了研究与分析。

The non-isothermal crystallization kinetics of polyoxymethyleneand poly- oxymethylene/co-polyamideat different cooling rates were investigated uisng differential scanning calorimetry.

采用差示扫描量热法研究了聚甲醛和聚甲醛/盐聚酰胺二元共混体系在不同降温速率下的非等温结晶行为，并用 Jeziorny 法、Ozawa 法和莫志深法计算了聚甲醛及其共混物的非等温结晶动力学参数。

Tetra-O-benzyl-D-glucose reacted with bromine to give glucosylbromide. It reacted with hydroxyl phenyl acetonitrile or hydroxyl benzaldehyde to give substituted ph- enylacetonitrile or substituted benzaldehyde.11 New stilbenes were synthesized possessing 2,3,4,6-tetra-O-benzyl-D-glucoside by condensation reaction with pheny lacetonitrile or benzaldehyde, which had potential biological activity and would be sieved in the future.

由2，3，4，6-四芐氧基葡萄糖作为中间体，首先制备出的溴代糖和含有羟基的苯甲醛和苯乙反应制备出含有糖的取代苯甲醛和取代苯乙，再和简单的苯乙或苯甲醛缩合反应生成11种具有潜在的生物活性且含有2，3，4，6-四芐氧基葡萄糖的类化合物，这些新化合物有待于进一步进行药理活性筛选。

A clean production technology of sodium sulfoxylate formaldehyde by one-step process with sodium pyrosulfite ,zinc powder and formaldehyde as raw materials was studied in detail.

详细研究了以焦亚硫酸钠、锌粉和甲醛为原料，一步法合成甲醛合次硫酸氢钠的清洁生产工艺，其最佳操作条件为：焦亚硫酸钠与锌粉物质的量比约1∶2.5，焦亚硫酸钠与甲醛物质的量比约1∶2.1，亚硫酸氢钠溶液的pH 3.3~3.6，活化温度≤45℃，最高温度97~102℃，高温反应时间

The effects of solution\'s pH value, mol ratio between phenyl aldehyde and L-Arginine, concentrations of sodium chloride, ammonia chloride andL-Lystine, initial concentration of L-Arginine on precipitation rate of a -tolylene arginine were investigated, the results indicated that phenyl aldehyde precipitation method\'s appropriate pH value was higher than 11, suitable mol ratio between phenyl aldehyde and L-Arginine was 1.25, initial concentration of L-Arginine was must higher than 15g/L, sodium chloride had little effect on precipitation rate, on the contrary, ammonia chloride and L-Lystine had great effect on it, both of them must be eliminated; At the same time, adsorption isotherm at 25 C of L-Lystine on anion exchange resin A was measured, the result showed that the maximal equilibrium adsorbance was 30mg/g, the influences of solution\'s pH value, temperature, concentration of chloride ion on adsorption of L-Lystine by anion exchange resin A were also studied, the results indicated that appropriate operational pH value was 0.5 0.2, the effect of temperature on adsorption ratio was little, process could be operated at room temperature, the concentration of chloride ion must be eliminated.

考察了溶液pH值、苯甲醛与L-精氨酸摩尔比、氯化钠与氯化铵浓度、L-赖氨酸浓度、L-精氨酸初始浓度对苯甲醛沉淀L-精氨酸的影响，结果表明，沉淀反应的适宜pH值大于11，苯甲醛与L-精氨酸的适宜摩尔比为1.25，(来源：Aa6BC论文网www.abclunwen.com)L-精氨酸适宜的初始浓度在15g/L以上，氯化钠的存在对沉淀率基本上没有影响，而氯化铵和L-赖氨酸的存在使沉淀率下降；同时测定了25℃时阴离子交换树脂A吸附L-赖氨酸的吸附等温线，表明其最大平衡吸附量为30mg/g，考察了溶液pH值、温度、氯离子浓度对阴离子交换树脂A吸附脱除L-赖氨酸的影响，结果显示从L-精氨酸和L-赖氨酸混合液中吸附分离出L-赖氨酸的适宜pH值为10.5±0.2，温度对L-赖氨酸吸附率影响不大，吸附过程可在室温下进行，氯离子的存在使L-赖氨酸的吸附率降低。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。