Prof. Songbo He was invited as a speaker

何松波研究员应邀担任演讲嘉宾

Title: Catalytic pyrolysis of paper sludge to recover circular minerals and produce bio-based chemicals

口头报告题目：制浆造纸污泥催化热解回收可循环矿物质和制备生物质基化学品

ABSTRACT：

       The pulp and paper industry produces a large number of solid "waste" - paper sludge (PS), of which the annual global production is over 16 million tons. PS is usually treated by incineration or landfill, causing secondary environmental issues such as soil, groundwater, and air pollution. As such, it is necessary to develop new technologies to valorize PS. PS mainly contains minerals (calcium carbonate) and biomass (cellulose, hemicellulose, and lignin), all of which can be recycled towards a circular bioeconomy. Based on the principle of thermochemical conversion, we have developed a fast pyrolysis technology and demonstrated the process on a pilot unit with a feed rate of 100 kg/h. The 7-hour continuous experiment showed that the recovery of solid minerals was over 99%. However, the calorific value of the obtained bio-oil was relatively low (about 17 MJ/kg). The bio-oil contains various low-concentration oxygen-containing compounds, limiting its direction application as a biofuel. Based on the principle of chemocatalytic conversion, we have further developed the ex-situ catalytic pyrolysis technology to improve the quality of bio-oil and the concentration of biomass-based chemicals. In this presentation, our latest study focusing on the catalytic conversion performance of several commercial catalysts and the catalyst deactivation behavior during the continuous catalytic pyrolysis of PS will be discussed.

摘要：

       制浆造纸工业副产大量的固体“废弃物”—制浆造纸污泥，全球年产量超过1600万吨，通常采用焚烧或填埋等方式处理，造成土壤、地下水以及空气污染等次生环境问题，亟待开发制浆造纸污泥资源化转化新技术。制浆造纸污泥主要包含矿物质（如碳酸钙）和生物质（纤维素、半纤维素和木质素），这些组分均可以回收利用以促进循环经济发展。基于热化学转化原理，我们开发了制浆造纸污泥快速热解技术，并完成了进料量100 kg/h的中试装置示范运行。7小时连续实验表明固体矿物质（即循环碳酸钙）的回收率高达99%，然而所获得的生物油热值相对较低（约17 MJ/kg），且由多种低浓度含氧化合物组成，应用潜力较弱。基于热化学催化转化原理，我们进一步发展了制浆造纸污泥非原位催化快速热解技术，将快速热解蒸汽进行催化转化以提高生物油品质和生物质基化学品浓度。此次报告，将重点介绍我们新近研究的几种商业催化剂的催化转化性能以及连续催化热解过程中催化剂的失活行为。