愈疮木酚和乙醛酸合成香兰素研究

对愈疮木酚和乙醛酸缩合—氧化合成香兰素路线进行了中等规模的研究。当反应温度为5 0℃ ,pH值为 12 ,愈疮木酚和乙醛酸物质的量比为 1 5∶1 0 ,缩合反应中乙醛酸的转化率可至90 %。以氢氧化铜为催化剂 ,以氧气为氧化剂 ,在pH值为 12 5和 94℃下反应 ,氧化产率为94%。香兰素的总收率 (以乙醛酸为基准 )为 70 %～ 72 %。生产废水经简单处理后可重复使用 ,并不影响收率 ,废水量可控制在 5t/t香兰素的水平。     

微电解-接触氧化法处理甲壳素生产废水

采用微电解-接触氧化-过滤-吸附工艺处理甲壳素生产废水,结果表明:铁炭微电解对CODCr的去除率达30%,pH由0.7提高到5.5;生化处理的CODCr去除率达80%以上。     

异辛酸和氯化胆碱生产废水处理工程实例

针对氯化胆碱生产废水有机污染物含量高,异辛酸生产废水可生化性差、含盐量高且具有生物毒性的特点,某化工企业废水处理站采用两段处理法,首先采用电解-IC工艺对异辛酸生产废水进行预处理,然后混合氯化胆碱生产废水和园区生活污水等进入水解酸化-兼氧-AO-MBR-混凝沉淀系统进行处理。运行结果表明：该组合工艺运行效果良好,COD、氨氮和总氮的去除率分别达95%、 98%和80%以上,满足企业所在地市政污水厂的纳管标准。     

1种综合处理ABS生产废水的方法

通过采用"絮凝+MBR+活性炭"的方法综合处理丙烯腈-丁二烯-苯乙烯共聚物(ABS)生产废水,首次采用了聚砜-纳米TiO_2中空纤维超滤膜组件。实验结果表明,3种方法的复合使用可以更高效的处理ABS生产废水,对COD和SS的平均去除率分别为99%和98.6%,从而使ABS树脂废水达到GB 18918-2002一级A排放标准,实现中水回用的目标,高效环保地解决了ABS废水处理中遇到的问题。     

不饱和聚酯树脂生产废水处理工程实例

文章介绍了不饱和聚酯树脂生产废水的处理方法。将厂区生活污水与生产废水混合处理,二者水量之比约为3：1。生活污水一部分进入混台池与生产废水进行混合;另一部分作为补给氮源直接进入好氧池。经气浮处理后的生产废水与生活污水混合后,采用厌氧-好氧．气浮-碳滤的组合工艺进行处理。经处理后的废水达标排放。     

络合萃取法处理2,3-酸生产废水的研究

本试验研究了采用络合萃取法回收 2 ,3 -酸生产废水中染料中间体的多种影响因素。试验表明通过萃取工艺处理 2 ,3 -酸生产废水是可行的 ,一级萃取出水CODcr在 10 0～ 2 0 0mg/L ,萃取率可达 96%以上     

Fe-C微电解-Fenton氧化处理二氯嘧啶废水实验

二氯嘧啶生产废水具有高矿化度、高COD和高色度特性,对环境污染严重,处理难度较大。采用Fe-C微电解-Fenton氧化-深度氧化-吸附等组合工艺处理二氯嘧啶生产废水,考察了进水pH、反应时间、H_2O_2加量、活性炭加量、氧化剂加量对废水处理效果的影响。优选出最佳处理工艺条件。采用此处理工艺处理二氯嘧啶生产废水,COD可降至18. 5 mg/L,色度总去除率为100%,水样颜色由棕黄色变为无色,出水COD和色度达到了国家一级排放标准。     

山梨酸生产废水预处理的研究

介绍了山梨酸生产废水的水质。采用混凝-汽提-臭氧氧化方法对山梨酸生产废水进行预处理。实验结果表明:经该工艺处理后,山梨酸废水中化学需氧量(COD)的去除率达到了99.3%。该预处理工艺在有效治理废水的同时,实现了资源回收,具有很好的工业应用前景。     

3,4-二羟基-5-硝基苯甲醛的合成

香兰素经常温硝化、脱甲基两步反应制得了恩他卡朋的中间体(3,4-二羟基-5-硝基苯甲醛)。以65%的硝酸对香兰素进行硝化,制得5-硝基香兰素,收率81.2%。用无水三氯化铝和吡啶对5—硝基香兰素进行脱甲基,制得3,4-二羟基-5-硝基苯甲醛,收率96%。总收率78%。     

两级A/O+MBR组合工艺处理胶囊生产废水

采用混凝沉淀+两级A/O+MBR+活性炭过滤组合工艺处理胶囊生产废水。运行结果表明,系统对主要的污染物COD和氨氮的平均去除率分别达到了97.1%和98.1%,处理后出水水质达到城镇污水处理厂污染物排放标准(GB 18918-2002)一级A标准。该工艺运行效果稳定,可为同类胶囊生产废水处理工艺路线选择提供参考。     

愈创木酚水汽蒸馏废水的综合利用

介绍了一种由邻氨基苯甲醚经重氮、水解过程生产愈创木酚过程中产生的水汽蒸馏废水的综合利用方法.将愈创木酚水汽蒸馏所得水相直接应用于香兰素的合成,大大减少了香兰素缩合反应所需的投料工艺水,同时省略了愈创木酚水汽蒸馏水相的萃取与废水处理过程,达到节能与循环利用的目的.按公司的生产规模,年可减少约20万t废水,使香兰素绿色生产工艺上了一个新台阶.     

双酚A型环氧树脂生产及其废水处理工艺综述

环氧树脂种类较多,生产方法差异较大,不同环氧树脂生产方法所产生的废水成分含量各异,本文综述了双酚A型环氧树脂的生产及几种废水的处理方法,期望对环氧树脂废水的处理提供借鉴和参考。     

Production of vanillin from wheat bran hydrolyzates via microbial bioconversion

BACKGROUND: Wheat bran contains a large amount of ferulic acid, which can be released through enzymatic hydrolysis and bioconverted into vanillin. A previous study has shown that ferulic acid purification from bran carbohydrates with the Amberlite^® IRA 95 resin allowed an increased vanillin molar yield. In this work, alternative ferulic acid recovery methods were proposed and the possibility of exploiting the residual carbohydrate‐rich water phase was explored. RESULTS: Ferulic acid was recovered from crude wheat bran hydrolyzate by: (i) a hydrophobic sorbent cartridge (ISOLUTE ENV^+®): (ii) ethyl acetate extraction; and (iii) the resin previously employed. The highest recovery percentage (95%) was obtained with ISOLUTE ENV^+®, which also allowed an interesting vanillin molar yield from ferulic acid bioconversion (75% from 0.5 mmol L^?1 ferulic acid). The residual water phase was a good growth substrate for the microorganism operating the bioconversion. Cells grown on this matrix could efficiently bioconvert the recovered ferulic acid to vanillin CONCLUSION: The possibility of efficiently recovering ferulic acid from wheat bran hydrolyzates, bioconverting it into vanillin, and valorizing the sugar‐rich exhausted water fraction was demonstrated in this work. The approach allowed the production of a value‐added fine‐chemical from a food‐industry by‐product. Copyright © 2009 Society of Chemical Industry     

离子交换法碳酸钾含氨氮生产废水的处理工艺改进

采用离子交换法生产碳酸钾时,低浓度含氨氮废水的回收是主要难题。选择性能稳定、工作交换容量大的交换树脂,可提高树脂和盐酸的利用效率,降低运行成本。采用半连续离子交换和解吸液循环增浓套用技术,可使树脂利用率提高30%,氯化铵提升到150 g/L以上,盐酸利用率96%。该技术不仅解决了氯化铵含氨氨废水的污染难题,同时也为副产盐酸找到合理的出路,经济和环保效益显著。     

亚硝化法生产香兰素的废水处理方法

主要介绍了亚硝化法生产香兰素废水的治理方法。亚硝化法生产香兰素主要有亚硝化反应废水(简称亚硝废水)与缩合反应废水(简称缩合废水)两种废水。缩合废水COD约为35000mg/L,氨氮浓度约为35000mg/L;亚硝废水COD约为12800mg/L,硝基物含量约为500mg/L,氨氮浓度约为2800mg/L。缩合废水先经浓缩回收氯化铵,再与亚硝废水混合,先后经铁碳还原、电解催化氧化、缺氧/好氧(简称A1/O)生化处理,最后排出的废水COD约为180mg/L,氨氮约为19mg/L,达到国家废水综合排放三级标准进入嘉兴市污水管网。     

对-羟基苯海因生产过程中含酚废水的处理

用蒸馏—萃取—大孔树脂吸附的工艺处理化学—酶法生产D 对 羟基苯甘氨酸过程产生的含酚废水 ,苯酚回收率接近 10 0 % ,每 2t废水可回收苯酚 16 0kg ,稀盐酸 170 0kg。蒸馏后的母液套用于对 羟基苯海因 (HPH)的合成 ,可使其收率提高 10 % ,回收得到的酚钠可用于合成     

A Coenzyme‐Independent Decarboxylase/Oxygenase Cascade for the Efficient Synthesis of Vanillin

Vanillin is one of the most widely used flavor compounds in the world as well as a promising versatile building block. The biotechnological production of vanillin from plant‐derived ferulic acid has attracted much attention as a new alternative to chemical synthesis. One limitation of the known metabolic pathway to vanillin is its requirement for expensive coenzymes. Here, we developed a novel route to vanillin from ferulic acid that does not require any coenzymes. This artificial pathway consists of a coenzyme‐independent decarboxylase and a coenzyme‐independent oxygenase. When Escherichia coli cells harboring the decarboxylase/oxygenase cascade were incubated with ferulic acid, the cells efficiently synthesized vanillin (8.0 mM , 1.2 g L ^?1) via 4‐vinylguaiacol in one pot, without the generation of any detectable aromatic by‐products. The efficient method described here might be applicable to the synthesis of other high‐value chemicals from plant‐derived aromatics.     

Process study on adsorption of glycerin from saline wastewater by strong base anion resin

A physicochemical method was used to adsorb glycerin in saline wastewater by strong base anion resin (D201). Boric acid, a kind of weak acid, can combine with glycerin, and a specific complex can be produced, which possess bigger molecule than glycerin. Then, this specific complex could be adsorbed by strong base anion resin. Via the experiment, the equation of adsorption isotherm with D201 at 20°C can be shown by lgx/m = 1.74lgC_e - 5.72; for column test with simulative glycerin wastewater, the treatment capability was more than nine bed volumes, and 39.77 mg glycerin could be removed by per gram resin. When the NaCl concentration was 10 g/L, five bed volumes of simulative wastewater could be treated, and the adsorb mass was 29.09 mg/g. When the NaCl concentration was 30 g/L, only three bed volumes of simulative wastewater could be treated, and the adsorb mass was 14.83 mg/g.     

树脂吸附法处理癸二酸生产中含酚废水的试验研究

用ＮＫＡ树脂对癸二酸 排出的含低浓度乳化油及低浓度酚废水进行脱酚处理，处理后水质达到国际排放标准。     

Treatment of DSD acid wastewater using a weak basic resin

The D301R resin was screened to separate DSD acid from DSD acid wastewater. The effect of pH, temperature and time on adsorption behavior was investigated. Batch experiments indicated that the COD removal ratio of DSD acid wastewater was over 86%, and the COD of treated wastewater was under 100 mg/L at appropriate operating conditions. The results of column dynamic adsorption and regeneration showed that COD could be efficiently removed by the D301R resin from DSD acid wastewater, and the resin was easily regenerated by NaOH stripping.