In order to address the poor compatibility between thermoplastic starch (TPS) and polyester during the blending process, this study employed the melt blending method to prepare poly (ethylene adipate-co-terephthalate) (PEAT)/thermoplastic starch (TPS) composite films. A series of composite films were evaluated for mechanical properties, micromorphology, thermal behavior, water absorption, and water vapor and oxygen barrier, systematic study was conducted on the effect of the amount of reactive chain extender poly((phenyl isocyanate)-coformaldehyde) (PAPI) addition for the performance of PEAT/TPS/PAPI composite films. The results indicate that PAPI, as the reactive compatibilizer, effectively improves the interfacial adhesion of PEAT/TPS blends. The research findings indicate that PAPI enhances the compatibility between PEAT and TPS by forming urethane bonds. The incorporation of PAPI significantly enhances the mechanical properties of the composite film, with tensile strength and tensile modulus increasing by 62 % and 88 % respectively, and toughness increasing by 48 %. Moreover, the incorporation of PAPI has enhanced the water vapor barrier properties of the composite film by 44 %, and improved its oxygen barrier properties by 26 %. The results obtained in this study provide a reference for the manufacture of PEAT/TPS composites, which will facilitate the practical application of PEAT/TPS composite films in the packaging film.

Poly(ethylene adipate-co-terephthalate) (PEAT), a biodegradable copolyester, is a high-toughness and low-cost material, with fracture elongation exceeding 1000%. However, the existing literature still contains few studies on its processing properties. In this study, the processing properties of PEAT with characteristic viscosities of 0.8 and 1.0 dL/g, respectively, were systematically compared. The thermal stability, rheological behavior, and degradation properties of the cast film (CFPEAT) produced by those two were compared. As well as the effects of different stretching temperatures on the mechanical and crystalline properties of biaxially oriented PEAT film (BOPEAT)were also studied. The results showed that PEAT with the characteristic viscosity number of 1.0 dL/g had better performance and that the BOPEAT film exhibited superior performance when the tensile temperature was 70 degrees C. The tensile strength increased from 29.44 to 41.35 MPa for CFPEAT, which increased about 40.46%, and the elongation at break was 390.88%. The XRD results revealed that biaxial stretching primarily improved the film's performance through strain-induced crystallization. The results of degradation experiments showed that PEAT had excellent degradation properties, and under alkaline environments, the degradation rate was faster.Highlights PEAT has excellent toughness and degradation properties. PEAT with the characteristic viscosity of 1.0 dL/g has better performance. BOPEAT is more rigid.

epsilon-Caprolactone is an essential monomer for the synthesis of poly-caprolactone and is primarily produced via the Baeyer-Villiger oxidation of cyclohexanone. This study focuses on the preparation of MgZnx-PSMy catalysts by loading Mg and Zn onto porous silica microspheres for the hydrogen peroxide oxidation of cyclohexanone to epsilon-caprolactone. The metal oxides exist in the form of clusters. The catalysts were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption analysis, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, ultraviolet-visible spectroscopy (UV-Vis), and X-ray photoelectron spectroscopy (XPS) to confirm their successful synthesis. The effects of catalyst preparation method, metal molar ratios, metal-to-support mass ratios, catalyst dosage, reaction time, reaction temperature, and hydrogen peroxide concentration on catalytic performance were systematically investigated, along with the reusability of the catalyst. Under optimized conditions, with an Mg:Zn molar ratio of 3:1, a metal-to-porous silica microsphere mass ratio of 0.21, a catalyst loading of 5 % (relative to the mass of cyclohexanone), a reaction temperature of 80 degrees C, and a reaction time of 10 hours, the cyclohexanone conversion reached 91 %, with an epsilon-caprolactone selectivity of 93 % and a yield of 84 %.

Polycaprolactone (PCL) is a highly regarded biodegradable and environmentally friendly material that is extensively researched and applied in the field of biomedicine due to its exceptional biodegradability, biocompatibility, and other advantageous properties. The monomer ε-Caprolactone (ε-CL) plays a critical role in the synthesis of PCL, making it a key focus of study. This paper describes the preparation of hydrotalcite HT-Zn and SBA-15 through simple synthetic methods, and the subsequent creation of a hydrotalcite/SBA-15 composite catalyst, named HT-Zn/SBA-15, through a post-generation approach combining hydrotalcite and SBA-15. Scanning electron microscopy (SEM), wide-angle X-ray diffraction (XRD), and infrared spectroscopy (FT-IR) were employed to analyze the structures of the synthesized materials. The catalytic effects in Baeyer–Villiger oxidation were then investigated to examine the impact of various catalysts, solvents, and reaction conditions. The results indicated that utilizing HT-Zn/SBA-15 as the catalyst, acetonitrile as the solvent, and H2O2 as the oxidant, led to a conversion rate of cyclohexanone exceeding 80

With the widely application of polycaprolactone-based biodegradable materials, the green production of e-caprolactone (e-CL) as a major synthetic monomer, had received widespread attention. In this paper, it was first proposed to use a simple separate operation for enzyme-catalyzed synthesis of e-CL, which enabled the yield of e-CL to be improved without complex modification of the enzyme, the factors led to enzymes inactivation during the reaction and the structure of the white undissolved filtered particles were analyzed in detail. As a result, compared with the conventional mixed reaction, this reaction method not only improved the effect of enzyme catalysis, and increased the yield of e-CL to 90%, but also made immobilized enzymes maintain the integrity of the particles during the reaction, and carriers were reused so as to reduce the production cost. At the same time, it was first demonstrated that the main cause of enzyme inactivation was the change in secondary structure content during the reaction, and the white undissolved filtered particles after the reaction was called hydroxyurea.

As an extensively utilized organic synthetic monomer, ε-caprolactone (ε-CL) exhibits notable properties such as biodegradability and biocompatibility. Consequently, the investigation of ε-CL monomer synthesis holds great significance. In this study, a tin catalyst containing magnesium named Sn-Mg-M, was synthesized by a simple method at ambient temperature and atmospheric pressure for the preparation of ɛ-caprolactone monomers. This study focuses on the characterization of catalyst structure using Fourier Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD), Thermogravimetric analysis (TGA). Furthermore, the catalytic effect of catalyst Sn-Mg-M in Baeyer-Villiger oxidation was investigated to examine the impact of various catalyst ratios, oxidant types, and reaction conditions on the catalytic effect. The experimental results demonstrated that a molar ratio of 4∶1 between Sn and Mg in the catalyst, a feeding molar ratio of 1∶4 between cyclohexanone and hydrogen peroxide (H2O2), a cyclohexanone concentration of 0.33 mmol/mL, and a catalyst-to-reactants mass ratio of 1.57∶1, along with a reaction conducted at 65 ℃ for 12 h, resulted in a cyclohexanone conversion rate of 73.27% and a yield of 24.16% for ε-CL. Additionally, it was confirmed that the catalyst exhibited structural stability and could be recycled.

针对100 kt/a己内酰胺装置重排反应热未有效利用,而杂苯除去杂质过程均在苯蒸馏塔中需要用低压蒸汽作为热源的情况,采用将重排反应热回收利用至苯蒸馏系统的方法,对装置进行了技术改造.实际运行结果表明,减少蒸汽用量11 t/h,同时提高了己内酰胺产品质量,每年可节约运行费用约1702万元,取得可观的经济效益,在己内酰胺行业具有推广应用价值.

根据紧急停车(ESD)系统的独立性和安全性的技术要求,结合某电子特种气体生产的特点,对高纯甲基硅烷的精馏装置的ESD系统进行了硬件配置及完善的逻辑设计.实际运行结果表明,不管是生产装置故障,还是系统本身故障,都能迅速响应,使生产装置达到设计的安全停车工况,满足了装置系统的独立性和SIL3安全综合等级要求,提高了系统的可靠性和稳定性,保障了装置生产的安全稳定.

在对己内酰胺生产过程中苯-己内酰胺溶液(简称苯己液)碱洗水洗工艺现状分析的基础上,通过水在苯己液中的溶解性试验及利用高效聚结滤芯除水试验,进行了苯己液的碱洗水洗工艺流程和参数的优化.结果表明:控制苯己液温度为30～35℃,苯己液中己内酰胺质量分数为15％～20％,将原有旋流脱水器取消,增加一台使用PH-APFP高效聚结滤芯制作的高效聚结器,在生产装置负荷为150％时,加入质量分数为2％氢氧化钠溶液1200 L/h、脱盐水500 L/h对苯己液进行碱洗水洗,经过碱洗水洗后的苯己液的电导率从改进前的70μS/cm降至15μS/cm,290 nm吸光度从改进前的0.30降至0.12;同时产品己内酰胺的质量得到提高,其碱度由改进前的0.065 mmol/kg降至0.04 mmol/kg,290 nm吸光度由改进前的0.03降至0.015,挥发性碱由改进前的0.227 mmol/kg降至0.204 mmol/kg.