提高工业萘产品产率的实践

萘是重要的化工原料之一,其用途广泛,在保证产品质量的前提下,提高产品产率是十分必要的。文章从生产实际出发,从原料组成、工艺操作、设备等方面分析了影响工业萘产率的主要因素,并根据生产实际提出了多项提高工业萘产率的举措,在生产过程中效果良好。     

改进设备提高工业萘的收率

本文探讨了工业萘两塔设备改进的问题和方向,以及在现行方案条件下,作者提出的加固方案。     

提高工业萘质量的途径

介绍了提高工业萘质量的措施和途径     

提高工业萘得率的途径

从操作和设备两方面分析影响工业萘得率的原因，介绍为提高工业萘得率在两方面所采取的措施。     

提高工业萘回收率技术措施的探讨

本文介绍了我公司工业萘的现状和生产工艺流程,并通过工艺优化、设备更新、加强技术操作等技术措施,提高工业萘回收率从而达到提高工业萘产量的目的。     

济钢化工厂提高工业萘收率的措施

济钢化工厂焦油蒸馏工序投运以来,工业萘收率仅为9.5%～9.8%。通过更换系统冷却设备、提高原料含萘量及入塔温度、增加蒸馏系统的热量供给、优化调整工艺参数等,使工业萘收率提高到10.5%以上,年创经济效益300万元。     

工业萘系统的技术改造

本文介绍了完善和稳定工业萘生产所进行的技术改造及采取的措施，以及实施后的效果。     

提高工业萘收得率的工艺参数优化

通过分析工业萘收得率低的原因,采取优化焦油蒸馏操作,用萘油清洗结晶机,改变混合油的利用方式和适当降低酚洗油含萘等措施,工业萘收得率提高1.34%,已取得很大的经济和社会效益。     

Increasing the filtration rate of phospho-gypsum using surfactant

Phospho-gypsum is a by-product of processing phosphate rock for phosphoric acid production by acidulation with sulfuric acid. The size distribution of phosphor-gypsum is a major factor for the economics of the process as it greatly affects the filterability of the acid. Surface active agents proved to be very effective additive for growth of gypsum crystals. Two phosphate concentrates, one from Egypt (New Valley) and the other from USA (South Florida) were tested for phosphoric acid production with modification of gypsum crystals using non-ionic surfactant (CMR-100) containing a mixture of C₆–C₂₂ sorbitan esters. The studies were carried out using a semi-continuous laboratory-scale unit simulating the dihydrate process conditions.The mean diameter of the phospho-gypsum crystals increases in the presence of surfactant for both phosphate concentrates. The surfactant leads to decreasing the viscosity and modification of gypsum crystals through decreasing the fine size fractions and attainment of large and uniform crystal shape. The mean diameter of New Valley phosphor-gypsum increases from about 30.0 μm to 36.6 μm while the mean diameter of South Florida phospho-gypsum increases from about 30.3 μm to about 38.4 μm. On the other hand, the average surface area of both New Valley and South Florida phosphor-gypsum were decreased from 4461 and 8069 cm²/g without surfactant to 3284 and 3995 cm²/g with surfactant, respectively. In addition, the surfactant leads to an increase in P₂O₅ recovery of 1–2%, which consequently improves plant productivity.     

Increasing the yield from volumetric MRI in patients with epilepsy

Volumetric magnetic resonance imaging has become a routine investigation in the management of patients with chronic partial epilepsy. However, even with the use of reformatted images, an underlying cause for epilepsy cannot be found in many of these patients. We show that further processing of the data, including three-dimensional reconstruction and quantitative analysis of the volume and complexity of the images in three dimensions, reveals additional positive information in up to 75% of patients. This may be useful for surgical planning, prognostication, and understanding of the structure and development of the human brain.