间苯二酚的生产技术现状

介绍了间苯二酚的主要用途和国内外生产现状 ,并对主要的生产方法磺化法和氧化法从环境效应上进行了比较 ,对今后我国间苯二酚的生产发展提出了建议     

The synergistic effect of dicyandiamide and resorcinol in the curing of epoxy resins

The synergistic effect of dicyandiamide (Dicy) and phenolic substances was studied, with resorcinol as a model compound. It was found that when Dicy and resorcinol are used jointly, the curing temperature of epoxy resin can be significantly lowered. FTIR and DSC data were used to illustrate the mechanism of the synergism. The addition of the phenolic hydroxyl group to epoxide was facilitated by Dicy, which favors the formation of phenoxy anions. The reaction of Dicy with epoxide was facilitated by resorcinol, which can exert “electrophilic assistance” for the addition of the amino group to epoxide. The presence of resorcinol also favors the addition of the hydroxyl group to the cyano group. The thermal and mechanical properties of the epoxy resins cured with Dicy/resorcinol or Dicy/phloroglucinol were studied. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1869–1874, 2003     

Structure of resorcinol,phenol, and furan resins by MALDI‐TOF mass spectrometry and 13C NMR

The structure of traditional, linear phenol–resorcinol–formaldehyde (PRF) resins, urea‐branched PRF resins, and phenol–resorcinol–furfural (PRFuran) resins has been investigated in depth by both matrix‐assisted laser desorption/ionization time of flight (MALDI‐TOF) mass spectroscopy and ¹³C NMR. The structure of a variety of oligomers has been obtained, and the structures present in each of the three types of resins related to the very different percentages of resorcinol needed for their equal performance as adhesives. The oligomers type and species distribution appeared very different for each case. PRF resins performance is improved by maximizing either the proportion of resorcinol‐containing oligomers or methylol‐groups containing oligomers, even without any resorcinol, or both. It is equally obtained by the minimization of the relative proportion of the low reactivity Phenol (CH₂ Phenol) species in which resorcinol is not present, this being the most important parameter. This can be obtained by more effective use of the resorcinol by just modifying the resin manufacturing procedure. This parameter instead does not appear to be determinant in PRFuran resins. In these, it is the higher molecular weight of furfural in relation to formaldehyde that engenders for the same manufacturing procedure a correspondingly lower proportion of resorcinol in the resin. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2665–2674, 2004     

间苯二酚六次甲基四胺络合物(PY)对白炭黑补强天然胶的影响

采用平衡溶胀法、力学性能以及老化性能，表征PY对白炭黑补强天然胶的影响。结果表明PY加强了橡胶-白炭黑界面的相互作用，使体系综合力学性能显著提高，加入了PY的硫化胶耐老化性也得到改善。     

利用新的指示反应褪色光度法测定微量铁的研究及应用

研究了在ｐＨ５．７－６．２的丙二酸介质和Ｔｗｅｅｎ－８０存在的条件下，间苯二酚酞与Ｆｅ的褪色反应的适宜条件。建立了一种光度的的新方法，可测定０－１６．０μｇ／２５ｍＬ范围内的铁，表观摩尔吸光系数为９．６×１０＾４，用于茶叶及酒样中铁的测定，结果令人满意。     

2,4,6-三(2,4-二羟基苯基)-1,3,5-三嗪的合成及结构表征

2,4,6-三(2,4-二羟基苯基)-1,3,5-三嗪是一种制备高效紫外线吸收剂的重要中间体,在工农业及医学中有许多重要的用途.用卤代烷烃作溶剂,无水三氯化铝作催化剂,在室温和常压下三聚氯氰与间苯二酚进行Friedel-Crafts反应,反应时间6 h,标题化合物的收率为96%.完善了原来的合成工艺,得到了一条操作简便,生产成本低的工艺路线,并提供了2,4,6-三(2,4-二羟基苯基)-1,3,5-三嗪化合物的IR,NMR,MS和元素分析值.     

Bimodal activated carbons derived from resorcinol-formaldehyde cryogels

Abstract

Resorcinol-formaldehyde cryogels prepared at different dilution ratios have been activated with phosphoric acid at 450 °C and compared with their carbonaceous counterparts obtained by pyrolysis at 900 °C. Whereas the latter were, as expected, highly mesoporous carbons, the former cryogels had very different pore textures. Highly diluted cryogels allowed preparation of microporous materials with high surface areas, but activation of initially dense cryogels led to almost non-porous carbons, with much lower surface areas than those obtained by pyrolysis. The optimal acid concentration for activation, corresponding to stoichiometry between molecules of acid and hydroxyl groups, was 2 M l^?1, and the acid–cryogel contact time also had an optimal value. Such optimization allowed us to achieve surface areas and micropore volumes among the highest ever obtained by activation with H₃PO₄, close to 2200 m² g^?1 and 0.7 cm³ g^?1, respectively. Activation of diluted cryogels with a lower acid concentration of 1.2 M l^?1 led to authentic bimodal activated carbons, having a surface area as high as 1780 m² g^?1 and 0.6 cm³ g^?1 of microporous volume easily accessible through a widely developed macroporosity.     

苯并[1,2-d:5,4-d']二((口恶)唑)-2,6-二硫醇的合成及表征

苯并(口恶)唑类化合物是一类重要的杂环化合物,不仅在生物、医药等方面有着广泛应用,而且在光学材料、高性能复合材料等诸多领域也显现出独特的性能.以间苯二酚为原料,经过酯化反应和Fries重排、肟化反应、Beckmann重排和水解反应合成4,6-二氨基间苯二酚盐酸盐(DAR· HCl).然后以4,6-二氨基间苯二酚盐酸盐和二硫化碳为原料合成标题化合物,并且优化了过程的工艺条件,过程的总收率为37.3％.利用红外光谱、核磁共振谱、质谱和元素分析等分析手段对中间产物及目标化合物进行了表征.     

间苯二酚产业现状与技术进展

综述了间苯二酚国内外产业现状及其生产工艺进展,对氧化法和磺化法进行了对比,阐述了两种工艺各自特点,并对国内间苯二酚的发展提出了建议.     

高效液相色谱法测定染发剂中对苯二胺及某些酚类物质的含量

本文采用了高效液相色谱法测定染发剂中对苯二胺、邻氨基酚、对苯二酚及间苯二酚。该法简便快速 ,检测下限分别为 0 .0 89、0 .2 5、0 .0 0 19和 0 .0 0 33毫克 /克 ,具有良好的精密度和准确度