INTRODUCTION

AqHF is commercially available in 49% and 70% solutions. Commercial AHF contains less than 400 parts per million by weight (ppmw) water. Although this report is intended as a guide for handling commercial grades of AqHF and AHF, additional information is given to aid users of AqHF and AHF who encounter other concentrations.

It is assumed that purchased AqHF or AHF is received and stored at ambient temperature. When temperatures are not indicated, the data are considered valid for ambient temperatures with only intermittent service up to 49°C (120°F). When temperatures are indicated, the data are considered valid for long-term service up to that temperature. Corrosion rates at temperatures greater than those indicated sometimes are so high that service life is not economical or product contamination might be great.

For critical design situations, more specific information is obtained from producers of AqHF and AHF, materials manufacturers and suppliers, equipment fabricators, and process licensors. HF alkylation unit users can refer to API⁽¹⁾ RP 7511 and Dobis et al.²

Additional resource materials are listed in the Reference and Bibliography sections. Metals and alloys mentioned in the text, tables, and figures are presented with their UNS ⁽²⁾ numbers in Appendix A. Where possible, UNS numbers are used throughout this report.

⁽¹⁾ American Petroleum Institute (API), 1220 L Street NW, Washington, DC 20005-4070.

⁽²⁾ Metals and Alloys in the Unified Numbering System (UNS), a joint activity of ASTM International (ASTM), 100 Barr Harbor Dr., West Conshohocken, PA 19428-2959, and SAE International (SAE), 400 Commonwealth Drive, Warrendale, PA 15096-0001.

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