N,N-Dimethylhydrazidoacrylamides. Part 1: Copolymers with N-Isopropylacrylamide as Novel High-Cloud-Point Kinetic Hydrate Inhibitors

作者：Mady Mohamed F; Kelland Malcolm A^*

来源：Energy & Fuels, 2014, 28(9): 5714-5720.

DOI：10.1021/ef501391g

Hydrophobically modified methacryl- and acrylamide polymers are well-known kinetic hydrate inhibitors (KHIs). Polymers of N-isopropylmethacrylamide (IPMAM) are now commercially available. However, both polyIPMAM and N-isopropylacryiamide homopolymer (polyIPAM) have low cloud and deposition points, making it difficult to use them in the field because of precipitation problems. Comonomers that are more hydrophilic can be copolymerized with IPMAM or IPAM to raise the cloud point. In this work, we have synthesized and investigated a series of new copolymers of IPAM and a new dimethylhydrazidoacrylamide monomer (DMHAM) as KHIs for the first time using high-pressure gas hydrate rocker rig equipment. The novel polymers have high cloud points in deionized water and also in brine solutions compared to polyIPAM. A 1:2 copolymer of DMHAM/IPAM gave the highest KHI performance for this class of copolymer with a cloud point at 58 degrees C in deionized water. A 1:1 copolymer gave only a small reduction in performance but has a cloud point of 83 degrees C in 3.6% NaCl and no cloud point in deionized water. Tests were carried out using high-pressure slow constant cooling rocking cell experiments with a structure-II-forming natural gas mixture at approximately 80 bar.

• 出版日期2014-9