顺酐溶剂吸收工艺技术的改造应用

顺酐溶剂吸收工艺以正丁烷法固定床气相催化氧化的反应合成气为原料,Conser公司工艺技术,通过对现有装置的改造,新增溶剂吸收和部分尾气回收、真空解吸、溶剂洗涤处理的生产工艺路线。实现提高产品纯度、提高收率的目的。装置能力2.0万吨/年固态顺酐生产能力,操作时间8000小时/年,装置操作弹性45～100%。该工艺采用的溶剂吸收法是目前国际上正丁烷法生产顺酐的典型的、成熟可靠的工艺方法。该工艺为连续操作,具有顺酐回收率高、原料正丁烷消耗低、产品质量好、运行连续稳定等优点。本装置经过可研阶段对几家国外公司的比选,综合评价后,选择采用Conser公司的溶剂吸收及尾气循环工艺技术,以DBP(邻苯二甲酸二丁酯)作为溶剂,对反应部分生成的顺酐进行吸收、解吸、再去精制获得液态成品顺酐。40%部分尾气循环回收再利用,溶剂经处理后循环使用。     

顺酐溶剂吸收工艺技术的改造应用

顺酐溶剂吸收工艺以正丁烷法固定床气相催化氧化的反应合成气为原料,Conser公司工艺技术,通过对现有装置的改造,新增溶剂吸收和部分尾气回收、真空解吸、溶剂洗涤处理的生产工艺路线.实现提高产品纯度、提高收率的目的.装置能力2.0万吨/年固态顺酐生产能力,操作时间8000小时/年,装置操作弹性45～100％.该工艺采用的溶剂吸收法是目前国际上正丁烷法生产顺酐的典型的、成熟可靠的工艺方法.该工艺为连续操作,具有顺酐回收率高、原料正丁烷消耗低、产品质量好、运行连续稳定等优点.本装置经过可研阶段对几家国外公司的比选,综合评价后,选择采用Conser公司的溶剂吸收及尾气循环工艺技术,以DBP(邻苯二甲酸二丁酯)作为溶剂,对反应部分生成的顺酐进行吸收、解吸、再去精制获得液态成品顺酐.40％部分尾气循环回收再利用,溶剂经处理后循环使用.     

顺酐溶剂法邻苯二甲酸二丁酯消耗详解

本文通过介绍正丁烷氧化法中的有机溶剂吸收法顺酐装置运行情况以及该工艺溶剂系统运行情况,分析出邻苯二甲酸二丁酯在本装置运行各个阶段的消耗情况,其直接影响着顺酐的生产成本。笔者据此提出顺酐溶剂邻苯二甲酸二丁酯的消耗详解希望为同行提供一定的参考。     

顺丁烯二酸酐回收工艺评述

顺丁烯二酸研（简称顺研，MA），自实现工业化生产以来，取得了很大进展。但由于MA在反应混合气中含量很低，因此，顺酥回收工艺在MA生产过程中占有重要地位。MA的传统回收方法为水回收法，采用廉价易得的水作为吸收剂，同时还具有吸收速度大的特点，但能耗大，顺研与水反应生成的顺酸或富马酸，不但腐蚀设备，而且还堵塞管道，甚至造成停车，同时还降低了产品的质量，此法收率低，一般只有SO％左右。MA的非水溶剂回收方法又分为物理吸收法和化学吸收法。这种回收工艺的研究集中于有机溶剂的选取和开发，工艺中应尽量提高吸收温度，一…     

顺酐装置溶剂系统故障分析及改造建议

介绍了兰州石化公司顺酐装置的运行情况,对溶剂在系统恶性循环过程中发生溶剂分解,形成聚合物,导致系统设备、管线堵塞,装置无法长周期运行的故障原因进行了分析,并提出了初步的改造建议。     

Conser顺丁烯二酸酐工艺溶剂消耗析因与对策

吐哈油田石油天然气化工厂2万t／a顺酐装置2007年引进了意大利Conser顺酐溶剂吸收工艺,该丁艺在吸收塔中以邻苯二甲酸二丁酯作为溶剂对反应气中顺酐组分进行吸收分离,顺酐的吸收效率和吸收过程中溶剂的损耗成为该工艺的关键控制指标。工艺设计过程中溶剂消耗为15kg／t顺酐,而在实际运行中溶剂消耗异常升高时有发生。从影响溶剂消耗的各种因素进行分析,找到了造成溶剂消耗偏高的问题,并从工艺参数优化调整和技术改造上提出了针对性措施,工艺运行中溶剂消耗得到有效控制。     

顺酐生产和发展

本文综述了目前顺酐生产的四种工艺路线,其中正丁烷氧化法制顺酐和溶剂吸收后处理是我国顺酐行业今后的发展方向。     

试论国内外顺酐工业的发展

本文介绍了顺酐生产工艺的新进展、世界生产能力、年产2000吨以上的生产厂家,以及美国顺酐在各种最终产品上的消耗量。如何选择原材料,以降低顺酐生产成本,是本文讨论的重要问题之一。认为,从经济效益考虑,顺酐生产的最小规模应为1万吨/年。随着我国乙烯工业的发展,今后发展顺酐工业应重视以正丁烷或混合C_4为原料,采用催化氧化流化床及溶剂法回收成品的新工艺。     

丁烷法制顺酐的溶液回收技术

正丁烷氧化法制备顺酐的工艺路线主要包括氧化工艺和后处理工艺。其中后处理工艺采用邻苯二甲酸二丁酯(DBP)作为溶剂具有顺酐收率高、加工成本低、生产操作较为简单、生产连续性好以及生产废水少的优势。溶剂再生系统是该工艺中重要的一部分,其目的是分离贫溶剂中的富马酸、苯酐、邻苯二甲酸、邻苯二甲酸单丁脂、水溶性重油以及不溶物等。溶剂再生系统包括溶剂水萃取系统、离心分离系统和溶剂回收塔系统。水洗+离心的DBP溶剂再生工艺可以有效提高溶剂的处理效率,同时减少废水中的化学需氧量(COD)。     

AIMA生产顺酐工艺

阐述以正丁烷为原料，流化床氧化、有机溶剂回收生产顺酐工艺，同时介绍ＡＬＭＡ工艺特点，并与ＳＤ固定床工艺进行了比较。     

溶剂对顺丁烯二酸酐含量测定的影响

顺丁烯二酸酐是一种重要的有机原料,对其含量的测定有很大意义.目前,文献上提到的顺丁烯二酸酐含量测定方法的误差较大.因此,研究了各种条件下测定顺丁烯二酸酐的含量.实验结果表明:用纯水、40 % DMF水溶液或40 %丙酮水溶液做溶剂时,都能够较准确测定顺丁烯二酸酐的含量,在有机体系中用40 %丙酮水溶液较纯水或40 %DMF水溶液好.     

Increased thermal and organic solvent tolerance of modified horseradish peroxidase

Horseradish peroxidase (HRP) was modified by maleic anhydride and citraconic anhydride. The thermal and organic solvent tolerances of native and modified enzyme were compared. These chemical modifications of HRP increased their thermostability both in aqueous buffer and some organic solvents, and also enhanced their tolerances of some organic solvents. We have studied the unfolding of native and modified HRP by heat to determine the conformational stability. The temperature at the midpoint of thermal denaturation (T(m)) was increased upon modification. Both enthalpy change (DeltaH(m)) and entropy change (DeltaS(m)) for unfolding of modified enzyme at T(m) were decreased compared with native enzyme. Circular dichroism studies proved that these modifications changed the conformation of HRP. The improvements of stability are related to side chain reorientations of aromatics upon both modifications.     

改性骨架镍催化马来酸酐加氢制备琥珀酸酐

将骤冷法制备的改性骨架镍用于马来酸酐(MA)的催化加氢,可在温和条件下高选择性地制备琥珀酸酐(SA)。考察了不同反应参数对该反应的影响,当采用1,4-二氧六环为溶剂,在0.2MPa和30℃的温和条件下反应60min,马来酸酐的转化率和琥珀酸酐的选择性均可达到100%。在上述条件下,该反应表现为零级反应,其表观活化能为27.1kJ/mol。     

正丁烷氧化制取顺酐的Huntsman工艺技术进展

正丁烷制顺酐Huntsman工艺于1975年首次由Monsanto公司(前Huntsman公司)实现工业化,该工艺采用了固定床列管式反应器、新型催化剂MarsV及有机溶剂吸收与精制新技术.2010年全球Huntsman工艺装置有10套左右,利用Huntsman工艺制顺酐的生产能力高达249 kt/a,其生产总能力约占整...     

快干制版涂料的研制

采用马来酸酐与松香直接制备马来树脂作成膜剂,马来酸酐的加成量为15%(ω)所制得的树脂最适宜用作该涂料的成膜剂。实验表明,制备的修版涂料对35~45℃下由盐酸和氯化铜组成蚀刻液具有防腐性能,能被5%(ω)氢氧化钠溶液溶解。成份为马来树脂、混合溶剂、分散黑染料的涂料,混合溶剂按丙酮、二甲苯与二丙二醇二甲醚的溶积比为2∶1∶1时,溶解能力、涂层质量及涂料的表干时间都较为理想。     

顺酐回收技术及发展趋势

顺酐是一种重要的有机化工原料，对国内外顺酐生产工艺中回收技术的发展进行了系统回顾。介绍了部分冷凝技术和水吸收技术的发展，详细介绍了以邻苯二甲酸酯、脂环酸酯和醇3类有机溶剂为主的有机溶剂回收技术的发展。并且结合对目前广泛应用的顺酐回收技术的分析比较，提出了国内外顺酐回收技术的发展趋势以供我国发展顺酐工业之参考。     

Epoxy resin particles, 2. An efficient synthetic method of epoxy resin particles in organic solvent by the aid of modified polyolefins as dispersant

Epoxy resin particles were efficiently prepared by addition of Bisphenol A diglycidyl ether to a solution of polyamine hardener in organic solvents containing polyolefin dispersants modified with maleic anhydride and maleimide. Aliphatic hydrocarbons and their mixtures with aromatic hydrocarbons were used as the reaction solvents. The size and size distribution of the particles could be controlled by modulating the difference in solubility parameter between the solvent and the polymer and by changing the reaction temperature. Smaller particles were formed when combined with more highly reactive amine hardeners. The particles prepared by this method showed a rough surface probably because of the polymer deposition on the finally formed particles in the final reprecipitation process. The present synthesis can afford an efficient method for manufacturing the epoxy resin particles in large scale.     

Microscopic observations of the swelling of a high-volatile bituminous coal in response to organic solvent

The swelling behaviour of individual coal macerals in response to solvents is thought to be important since it represents an early stage in the disintegration of the coal, which is, in turn, of fundamental importance to coal hydrogenation at elevated temperatures. Therefore, a detailed incident-light microscope study of solvent-treated, polished coal surfaces, involving a new edge-on mode of observation, was undertaken in order to observe the way in which solvents interact with the different coal macerals. This study was carried out on blocks of Bayswater Seam coal, using tetralin, pyridine, and 1:3 maleic anhydride-xylene solutions at temperatures near their respective boiling points. The degree of swelling of the polished coal surface depends on the nature of the organic solvent and the individual coal macerals. Vitrinite and, in some instances, low-reflectance semifusinite exhibit varying degrees of swelling in response to the solvent treatment; whereas exinite and the majority of the inertinite macerals appear to be unaffected by the solvents. Within the vitrinite group the lower-reflectance sub-macerals exhibit the greater degree of swelling. At temperatures of less than 200 °C the ability of the solvents to produce swelling in the coal decreases in the order pyridine → 1:3 maleic anhydride-xylene → tetralin.     

Characteristics of cellulase modified with amphiphilic copolymer in organic solvent

Characteristics of modified cellulases in organic solvents were studied. Cellulases modified with amphiphilic copolymer of polyoxyalkylene (POA)-derivative and maleic acid anhydride (MAA). Amino groups of the cellulase molecule were easily coupled with the MAA functional group of the copolymer. At the maximum degree of modification (DM) of 55%, the activity of modified cellulase retained more than 80% of the unmodified native cellulase activity. The modified cellulase using AKM-1511 with DM greater than 40% was found to be more than 90% soluble in aqueous solution of acetone and ethanol, leaving the native cellulase and impurities in the fermentation broth with the residue. Modified cellulase showed excellent stability against water-insoluble solvent. Moreover, cellulase modified with hydrophobic copolymer, which consists of ethylene oxide (EO) and propylene oxide (PO), could be dissolved in these solvents.