Refinery Solutions & Case Studies

1. Corrosion protection for atmospheric and vacuum distillation

Where the corrosion comes from

Crude oil contains HCl (main source: hydrolysis of organic chlorides), H₂S and organic acids. During the distillation process, highly corrosive liquids are formed in the gas phase condensation area at the top of the tower, which is the core control area of the refinery's "one removal and four injections". Typical corrosion rates can reach >1 mm/a, causing frequent heat exchanger leaks and tower top pipeline perforation accidents.

The fix

use BXH-101 Water-soluble corrosion inhibitor Inject wash water at the top of the tower (recommended concentration 20–50 mg/L), with BXH-102 Oil-soluble imidazoline intermediate Inject side-line distillate oil (10–30 mg/L) to form a water phase and oil phase dual-channel protection system. The target corrosion rate is reduced to 0.05–0.10 mm/a (industry excellent level).

Customer cases

A CNPC Refinery CDU (2009)

Formal field trial of a neutralizing corrosion inhibitor formulated with the BXH-101 inhibitor component; tri-party stamped trial summary archived

A Coastal Refinery No.2 CDU

Successful trial of BXH-103 phosphorus-free high-temperature inhibitor, verified by the client group research institute scale-sample analysis; signed application report archived

Concentrate export deliveries

Multiple BXH-101/102 concentrate export orders delivered on schedule since 2025 and accepted by overseas customers

2. Phosphorus-free protection for high-temperature units

The problem

Vacuum residue treatment and high-temperature hydrogenation reactor effluent system (250–320°C) exceed the temperature limit of ordinary imidazoline corrosion inhibitors. At the same time, many provincial parks will implement strict phosphorus content emission standards from 2026, and traditional phosphorus-containing high-temperature corrosion inhibitors face compliance risks.

The fix

use BXH-103/RUN-129 Phosphorus-free high temperature corrosion inhibitor, the phosphorus content is <0.001%, and the film formation integrity rate is >85% under 300°C working conditions. It simultaneously solves the two major pain points of high-temperature corrosion protection and environmental compliance without additional wastewater treatment costs.

Which one to pick

Plan	Applicable Temperature	Phosphorus Content
Ordinary imidazoline	≤180°C	Phosphorus-free
Phosphorus high temperature agent	≤280°C	High phosphorus
BXH-103	≤300°C	Phosphorus-free✔

3. Coker Gas Oil Denitrification Solution

As refinery feedstocks become heavier and lower in quality, demand for coker gas oil denitrification keeps growing. Benxin applies a non-hydrogenation complexation process, backed by an in-house developed process, with full support from lab trials to on-site engineering service. View the full denitrification solution →

Coker gas oil denitrification

A Shandong independent refinery

Non-hydrogenation complexation denitrification project (tank settling process): reduces basic nitrogen and improves FCC feed quality.

Coker gas oil denitrification

A Shandong group · two refineries (A/B)

Measured results: basic nitrogen reduced from 1136/1585 μg/g to 429.8/772.5 μg/g at ~1.0-1.1% dosage.

Who we serve

Hubei Benxin Environmental Protection Technology corrosion inhibitor products are already available in Sinopec (SINOPEC), China National Offshore Oil Corporation (CNOOC), China National Petroleum Corporation (CNPC), Dongming Petrochemical, Yanchang Petroleum, BEFAR GROUP, SINOCHEM ENERGY, etc. Large refining and chemical companies Atmospheric and vacuum distillation, catalytic cracking, delayed coking Stable application in core units such as Through strict on-site evaluation and long-term operation verification.