硫磺回收装置克劳斯系统堵塞原因分析及对策

中海油气(泰州)石化有限公司东区10 kt/a硫磺回收装置克劳斯系统频繁出现堵塞问题,切炉频率较高,严重影响装置正常运行。分析发现堵塞物为SiO₂,酸性水汽提装置的酸性气是引起堵塞的主要原因,确定了催化裂化装置的外购原料油是硅的最终来源。通过对外购原料油中的硅进行严格控制,将高硅和无硅原料油进行调合,降低原料中的硅含量,进装置酸性水中硅质量分数由540.0μg/g降低到0.5μg/g,克劳斯系统的堵塞情况得到明显改善,切炉频次大大降低,由原来的最短12 d切换一次变成72 d切换一次。对原料进行优化,少采购或不采购含硅原料油,该装置的克劳斯系统没有发生堵塞现象,装置运行稳定。     

酒钢含铁物料使用情况浅析

本文对酒钢公司含铁物料的进料、消耗、质量情况进行了统计分析,提出目前铁料采购、使用中存在的问题,并就一些问题提出了改进措施。     

采购产品的验证

在采购产品的验证中结合采购产品的采购要求、关注采购产品在工艺过程中受到的影响以及采购产品对最终产品的影响。根据设计输出和不同采购产品的重要程度制定验证方案。此外,还列举了一些采购产品验证相关的典型案例,分析了其中验证不足的原因,以供参考。     

强化外购件管理是保证木工机床整体质量的关键

随着木工机械木工机床市场销量的增大,木工机床生产企业的外购件或外协作加工的零部件数量也随之快速增加,为杜绝忽视外购与外协件的质量管理,从而影响主产品的整机性能与质量。本文就加强外购件与外协件质量管理的重要意义、外购件与外协件的重要度分级、管理措施作了扼要的叙述。     

对企业并购过程中商誉问题的思考

目前，随着我国企业兼并与重组业务的不断发展，随着全球经济一体化趋势的演进，集团并购日益成为一种普遍的现象，如何处理并购中产生的商誉问题，会计界存在3种不同的观点；（1）单独确认为一项资产，并在预计的有效期内予以摊销；（2）将其直接冲减控股公司的股东权益；（3）将其作为一项永久性资产，对合并商誉确认和处理的上述不同方法进行比较；在此基础上，对我国合并商誉的会计处理进行分析，探讨其不足之处；并重点对合并商誉确认和处理的未来发展提出合理性建议。     

装备采购分承包合同管理研究

立足于提高装备采购整体效益,分析了目前装备采购分承包合同管理中存在的主要问题,总结了外军装备采办分承包合同管理的有益做法,深入阐述了加强我军装备采购分承包管理的具体对策建议。这些建议包括:强制推进配套件竞争性采购、重视提高军工生产能力、规范分承包合同管理方式、实行分类分级管理、尽快制订分承包合同管理法规等。     

Anthocyanin composition of cauliflower (Brassica oleracea L. var. botrytis) and cabbage (B. oleracea L. var. capitata) and its stability in relation to thermal treatments

Violet cauliflower and red cabbage were analysed for their anthocyanin profiles before and after thermal treatments. Anthocyanins are well-noted as healthy compounds due to their antioxidant properties. Samples were analysed for total anthocyanin content by using a spectrophotometric differential pH method. An MS-based method, combining high-performance liquid chromatography (HPLC) with quadrupole tandem mass spectrometry (HPLC–MS/MS) was developed, aimed to separate, identify and quantify the main anthocyanin forms. The procedure involves a rapid and efficient pre-treatment of the samples by solid-phase extraction, followed by selective determination of all compounds in a single run analysis using HPLC–MS/MS. Structural information for the identification of compounds was obtained from their fragmentation patterns (MS/MS spectra). The compounds were separated by HPLC and detected in the multiple reaction monitoring mode (MRM), which provides a high level of selectivity for targeting the analytes in vegetables. Cauliflower and red cabbage showed differences in their anthocyanin profiles: cyanidin-3,5-diglucoside was absent in cauliflower, while it was well represented in red cabbage, together with the characteristic anthocyanin of Brassica genus, cyanidin-3-sophoroside-5-glucoside. The p-coumaryl and feruloyl esterified forms of cyanidin-3-sophoroside-5-glucoside were predominant in cauliflower, while the sinapyl one was mostly present in red cabbage. Besides, the stability of cauliflower’s anthocyanin profile was evaluated in relation to thermal pre-treatments. All thermal treatments, except microwave heating, drastically reduced total cauliflower anthocyanin content. The amount of individual anthocyanins was expressed as the percentage with respect to total anthocyanin amount, spectrophotometrically measured. Significant individual changes were observed after different thermal treatment with an isomer formation.