精苯再生酸的净化工艺研究

采用萃取法净化精苯再生酸。利用相似相容原理,使废酸中的有机物转移到萃取剂中,使硫酸分离出来。通过萃取处理,废酸中的CODCr由13.56×104降至3.92×104 mg/L,CODCr去除率〉70%,回收的净化酸可用于硫铵制备。     

再生酸治理的研究

通过再生酸净化处理各种方法的比较，介绍了以法治理再生酸的试验情况，试验表明，该法处理后的再生酸，可用于硫铵生产，并可获得较好的经济和环境效益。     

精苯再生酸净化方法的选择

在介绍再生酸净化方法的基础上,比较了外掺沉淀吸附法和萃取吸附法,指出,两种方法的净化效果基本相同,但在工业生产中,外掺沉淀吸附法的经济效益明显好于萃取吸附法。     

静置分层法净化精苯再生酸

介绍了净化再生酸的静置分层法,将处理剂ANPA加入再生酸中,搅拌后静置,使再生酸分层分离而得到净化。该法具有操作简单、无二次污染和经济效益好等优点。     

精苯再生酸的组成分析

再生酸组成分析的结果表明,除含有50%~60%的硫酸外,还含有29种有机物,其中含量最高的是吡啶及其同系物和酚类。     

萃取—吸附法净化再生酸

简述了焦化厂再生酸的净化方法，通过利用C－I萃取和P－I吸附，使再生酸达到工业品级的标准，从而拓宽了再生酸的利用途径。     

净化喷射再生技术改造设计总结

阐述了将变脱脱硫液的高塔再生改为自吸空气喷射再生新工艺,并对改造效果做了评价。     

精苯再生酸物理性质的测定

测定了攀钢煤化工公司精苯再生酸的密度、酸含量、透光率、色度和COD_(cr)等物理性质为再生酸的净化研究提供了可靠的依据。     

铅锌烧结机烟气制酸稀酸洗涤净化的改造

我厂在1975年开创了单台110m~2大型铅、锌烧结机烟气制酸的先例。净化工序采用稀酸洗涤流程。烧结机二氧化硫烟气经电收尘器、高温风机进入空塔、泡沫塔洗涤,一段电除雾器、石墨冷凝器、二段电除雾器除雾、降温再经除汞塔、干燥塔、主鼓风机,然后进入转化、吸收。 实践证明这一流程基本是可行的。但是由于烧结机烟气SO的_2浓度低(SO_2进入转化3.8～4.2％)、含尘较高,以及电收尘器、泡沫塔、酸冷却器等设备的结构、型式不能适应冶炼烟气制酸的要求,造成稀酸洗涤难     

浅谈油液的综合净化与废油再生

油液的综合净化和废油再生是当前节约工业油料的重要措施,根据油液受污染的程度,采用综合净化与再生的方法进行处理不仅可以带来显著的经济效益,而且对于节约日益紧缺的油料资源和防止环境污染具有重大的社会意义。     

新钢焦化厂新煤气净化系统的开工

分析了新煤气净化系统的开工方案及开工步骤，并论述了开工要点及遗留问题。     

焦化厂脱酸蒸氨装置的工艺优化

文章结合兖矿国际焦化有限公司化产车间所采用的氨硫循环洗涤-脱酸蒸氨-氨分解硫回收工艺,简要介绍了系统工艺流程和反应原理,对脱酸蒸氨装景生产中存在的问题进行了原因分析,并给出了优化措施.     

高锰酸钾法合成壬二酸及分离提纯

采用高锰酸钾氧化法合成壬二酸。以油酸和高锰酸钾为原料,经过条件试验,得出在温度为50℃,反应时间为8h的条件下,15—20mL乙醚为萃取剂时,壬二酸收率最高,约为34％。     

Modeling of Phosphoric Acid Purification by Liquid‐Liquid Extraction

Phosphoric acid is an important industrial chemical. It is mainly produced by the wet process which consists of an attack of the phosphate rock by sulphuric acid leading to a complex solution containing a large number of impurities such as metal ions like Fe³⁺, Al³⁺, Mg²⁺, Cd²⁺ etc., which can effectively be recovered by solvent extraction process. In this present work a model of the liquid‐liquid extraction process is presented. It is mainly based on thermodynamics, where two different routes have been tested for the modeling of the complexation process. The method has been tested using a model system with Al³⁺ as the contaminant, dodecyl naphthalene sulphonic acid (HDDNSA) as the complexing agent and kerosene as the diluent. The study has also investigated the influence of various parameters such as the pH of the aqueous phase and the initial concentration of the phosphoric acid.     

Purification of Wet‐Process Phosphoric Acid by Hydrogen Peroxide Oxidation,Activated Carbon Adsorption and Electrooxidation

In this work, three technologies are studied for the purification of phosphoric acid produced by the wet process: chemical oxidation with hydrogen peroxide, adsorption onto activated carbon, and electrochemical oxidation by boron‐doped diamond anodes. The treatment of wet‐process phosphoric acid by chemical oxidation with H₂O₂ as oxidizing agent can remove 75 % of the initial TOC as maximum, indicating that this wet‐process phosphoric acid contains an important amount of organics that cannot be oxidized by hydrogen peroxide under the operation conditions used. High temperatures and hydrogen peroxide/TOC ratios close to 150 g H₂O₂/g TOC allow obtaining the best chemical oxidation results. The adsorption onto activated carbon can remove between 40 and 60 % of the initial TOC as maximum. Adsorption times of 2 hours and activated carbon/WPA ratios close to 12 g AC/Kg WTP assure both steady state and maximum adsorption of organics. The electrochemical process is the only technique by which complete mineralization of WPA organics can be achieved. Operating at 60 mA cm^–2 and at room temperature, high current efficiencies are achieved which only seem to decrease by mass transport limitations.     

Purification of Ellagic Acid by UF Membranes

Ellagic acid (2, 3, 7, 8‐tetrahydroxy(1)benzopyrano(5, 4, 3‐cde)(1)benzopyran‐5, 10‐dione) was selected as a model pollutant which is present in the tannic fraction of cork processing wastewater. The ultrafiltration of aqueous ellagic acid solutions through three membranes was studied in tangential UF laboratory equipment. Two of the membranes were polyethersulfone (Biomax10K and Biomax5K, with MWCO of 10000 and 5000 Da, respectively), and the third made of regenerated cellulose (Ultracel5K, with MWCO of 5000 Da). The water hydraulic permeability was evaluated for each membrane. The evolution of the permeate flow rate with processing time was followed, and the influence of the main operating variables (feed flow rate, trans‐membrane pressure and nature of the membranes) on the permeate flux was also established. According to the hypothesis of the film theory, the intrinsic and apparent rejection coefficients, as well as the mass transfer coefficients, were also determined, and the values obtained were discussed as a function of the operating conditions used.     

焦化除尘灰回配配煤炼焦实践与应用

结合焦化厂除尘灰工艺性质及现状,在单炉组试验的基础上,建立了除尘灰回配炼焦工艺方案。用1.0%的除尘灰替代气肥煤回配到炼焦煤中参与炼焦,所得焦炭质量保持稳定,并在一定程度上改善了焦炭冷态强度,使除尘灰在焦化系统中闭路循环,在实现除尘灰高价值利用、节约煤源等方面产生了显著效益,年可产生经济效益766.5万元。     

中水回用于工业锅炉用水可行性实验研究

以污水处理厂的中水作为原水,采用双膜工艺（连续微滤膜CMF与反渗透膜RO的集成膜分离技术）,进行中水回用于工业锅炉用水的可行性实验研究,实验结果表明出水达到我国低压锅炉水质标准。     

对甲基苯甲酸的提纯

本文提出了一种新的对甲基苯甲酸的提纯方法，对于通过对二甲苯氧化制取的对甲基苯甲酸的提纯具有普遍意义。